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Discussion Starter · #1 · (Edited)
Hey guys,

This is my first ever car build thread. This will not be a heavy modified build, there will be parts added over time, but I want to use this car for exploring back roads and taking photos to document my trips.

My dad actually bought this car back in October of 2016 from a used car dealership with only 4,300 miles on it. I drove by it everyday on my way to work, and told him how great it looked and that he should go and check it out. A week later I drove by the dealership and the car was gone, but to my surprise my dad had it sitting in my driveway when I got home. We promptly took it out to the nearest back road to test it out. This was my first ever drive in a WRX STi, and it was a lot of fun! I have always loved looking at them and doing some research on them, but never had the chance to drive one until that day.

A few weeks later my dad (with my help) researched and ordered a Perrin CAI. The evening we received it he pulled his car in my garage, we ripped out the stock intake, and replaced it with the red Perrin CAI. As soon as we had it installed we took it out on the street to test it out. Immediately we both noticed the awesome new tone of the turbo and blowoff valve, it seemed to add so much more drama to driving the car, even if much power was not added.

My dad loved this car, he has always wanted a badass car to drive around and have fun with, especially one he could use in the winter. Sadly March 18th of this year, he passed away in his sleep. I have since taken over the car, and will be keeping it just because I know he would have wanted me to.

To this point the car is basically stock, it has a Perrin CAI, window rain deflectors, window tint (not sure what percentage, they were tinted when the car was purchased). Then last week I picked up an Escort Max 360 radar detector with a wire kit to hard wire the detector to the self-dimming rear view mirror. Currently on the horizon I would like to add some mudflaps and exhaust. Also some other odds and ends that I think add nice touches, which is another reason I'm here, I would like to have feedback from anyone that has any on part selection and new ideas for modifications.
 

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I actually looked at this exact STi back when it was still for sale lol. But if you haven't already you have to tune for that perrin intake or it could cause harm to your motor.
 

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Discussion Starter · #3 ·
I actually looked at this exact STi back when it was still for sale lol. But if you haven't already you have to tune for that perrin intake or it could cause harm to your motor.
Wow really, that's pretty crazy!! I'm not sure if my dad had it tuned or not, I'm gonna say he didn't. Is that something I can have done at the Subaru dealership, or is that more of a specialty shop thing?
 

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Wow really, that's pretty crazy!! I'm not sure if my dad had it tuned or not, I'm gonna say he didn't. Is that something I can have done at the Subaru dealership, or is that more of a specialty shop thing?
First, sorry for your loss man, that can't be remotely easy.

You're going to want to pickup a Cobb Accessport to tune it. I'm not sure if anyone offers a ready to go tune for the Perrin CAI or if you'll need a custom one made by one of the various tuners.

But that's one good looking STI... feel free to ask questions
 

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Discussion Starter · #5 ·
First, sorry for your loss man, that can't be remotely easy.

You're going to want to pickup a Cobb Accessport to tune it. I'm not sure if anyone offers a ready to go tune for the Perrin CAI or if you'll need a custom one made by one of the various tuners.

But that's one good looking STI... feel free to ask questions
Thanks.

I just came across the Cobb Accessport yesterday actually, they seem pretty legit to me lol! Is that really the only way I can get the tune I need? It may be a little bit before I can drop $650 to get the tune done.

Thanks! I think this damn car is beautiful, it looks great sitting in my garage lol, cant wait to take some more road trips and get some other awesome shots!
 

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Thanks.

I just came across the Cobb Accessport yesterday actually, they seem pretty legit to me lol! Is that really the only way I can get the tune I need? It may be a little bit before I can drop $650 to get the tune done.

Thanks! I think this damn car is beautiful, it looks great sitting in my garage lol, cant wait to take some more road trips and get some other awesome shots!
Well it's the easiest way to get the tune done. There are a couple other ways such as Ecutek but COBB is the widely accepted standard it seems for the current generation WRX/STI. There's a lot more support for it.

I would highly suggest removing the intake until you're ready for the tune in that case, these engines are extremely sensitive to any changes to hardware which can lead to engine failure.

Otherwise I feel you man, just take it out and enjoy it on some back roads, road trips. They are such fun and rewarding cars to drive. I'm tempted to go on a road trip myself as well just as an excuse to drive my car hah!
 

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Sorry for your loss, losing a parent is one of the most difficult life experiences one can go through.

I would put the OEM air box back on until tuned properly. Also, you mentioned a BOV. Does it have an aftermarket BOV, or the OEM BPV?
 

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Discussion Starter · #8 ·
Sorry for your loss, losing a parent is one of the most difficult life experiences one can go through.

I would put the OEM air box back on until tuned properly. Also, you mentioned a BOV. Does it have an aftermarket BOV, or the OEM BPV?
Thanks, yeah last few weeks have been pretty difficult.

So crazy, I have not worked on cars for a few years now, but did not know adding a CAI would need a tune. I mean I know there is more air flow, but I just assumed the ECU would know this and adjust fuel settings accordingly. Only thing we changed was the CAI, I would assume it would have the OEM BPV.
 

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Discussion Starter · #9 ·
Okay so obviously from what everyone has been telling me, I need to a tune if I want to continue running the Perrin CAI. If I do grab the Cobb AP, how to I get the map for the specific CAI that I have?
 

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If I do grab the Cobb AP, how to I get the map for the specific CAI that I have?
That's the tricky part. The accessport itself does not come with a map that will support your intake. Back in the day I used to have a Perrin cai on my wrx. Perrin actually supplied me with a map for their intake. I would call them first to ensure that they still offer mapping for their intake for the accessport, and then if they do, go ahead and buy the accessport.

I would stay out of boost until you either put the stock intake back on or get a tune. FYI.
 

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Discussion Starter · #11 ·
That's the tricky part. The accessport itself does not come with a map that will support your intake. Back in the day I used to have a Perrin cai on my wrx. Perrin actually supplied me with a map for their intake. I would call them first to ensure that they still offer mapping for their intake for the accessport, and then if they do, go ahead and buy the accessport.

I would stay out of boost until you either put the stock intake back on or get a tune. FYI.
Thanks for the info. It has been driven maybe 3.5-4k miles with the CAI installed and has had no issues, codes, do you think I have just been lucky thus for?
 

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Discussion Starter · #12 ·
Well Perrin does not offer mapping for their CAI, and the rep was also telling me that if the car is 100% stock (other than the CAI) the car does not need a tune. Reason that is the case I guess is because he said they could not get their CARB approval in California if the CAI required a tune...
 

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Hey how's it going, I'm also in Morgantown! First off, really sorry to hear about your Dad, I know first hand how hard it can be. On to the less depressing things, I can tell you hands down that you are going to want to take that intake off until you can get a tune. Luckily, you're only an hour and a half from TPG, which is an amazing tuner. You should contact them and see what your options are, but no matter what perrin said, they're not going to cover your car if the intake leads to a failure. They're there to make you buy things. Put your stocker back on for now.

I also have a stock SPT Exhaust from my car that I swapped out with an ETS catback. It looks like you have the stock exhaust, so if you'd like to swap and put a little cash on top in order to get a little sound out of your ride, I'll even help you install it. Welcome to the forum

-Chad
 
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irickchad pretty much covered it, but I will go into a little more detail.

A lot of companies like perrin, and mishimoto claim that their intakes require no tune. If you do a little digging you will find proof that this is not the case via datalogs of other people. And 99.99999999% of the time an intake will not throw a CEL or show any abrupt or drastic changes to notice and go "oh, well that's not good".

Our cars are MAF sensor based, meaning that the ecu is programmed to the stock intake and how much air the stock intake is pulling in. Without proper MAF scaling (tune) the car will be sucking in more or less air than it thinks or the MAF is telling it to compensate for in fueling. Just because you car seems fine, it really isn't. And slowly but surely you are working your way towards probably needing another shortblock.
 

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Also, just to tack on, since you're learning. Your car doesn't have a "blow off valve".. it has a Bypass Valve. They're the same, but different. A blow off valve vents air to the atmosphere, getting it out of your intake system. A bypass valve does the same thing, but vents that air back into the intake plumbing, so you don't get any unmetered air. That's why people don't suggest aftermarket blow off valves :)
 

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Discussion Starter · #16 ·
Hey how's it going, I'm also in Morgantown! First off, really sorry to hear about your Dad, I know first hand how hard it can be. On to the less depressing things, I can tell you hands down that you are going to want to take that intake off until you can get a tune. Luckily, you're only an hour and a half from TPG, which is an amazing tuner. You should contact them and see what your options are, but no matter what perrin said, they're not going to cover your car if the intake leads to a failure. They're there to make you buy things. Put your stocker back on for now.

I also have a stock SPT Exhaust from my car that I swapped out with an ETS catback. It looks like you have the stock exhaust, so if you'd like to swap and put a little cash on top in order to get a little sound out of your ride, I'll even help you install it. Welcome to the forum

-Chad
That's awesome, glad to have someone with a lot of knowledge in the same town! Where abouts in Morgantown? I just bought a house over in the Cheat Lake area last year. Also thanks for the condolences.

Looks like I will have myself a few weekend car projects to do, should be receiving some Rally Armor mudflaps, led license plate lights, and swapping out the intakes. I know I still have the stock intake around somewhere, just worried about having all the pieces in one spot. I'm assuming it would not be advisable to keep the Perrin intake on a just schedule an appointment with the tuner you mentioned within the next week or so? As I do not drive the STi daily, my gf and I live together and work together so we mainly use her car.

As far as the exhaust, I do definitely need one as the stock is waaaay to quiet for my liking. I have mainly been looking at the Nameless 4" catback, but I am definitely interested depending on sound and price of everything. Thank you for all the information!

irickchad pretty much covered it, but I will go into a little more detail.

A lot of companies like perrin, and mishimoto claim that their intakes require no tune. If you do a little digging you will find proof that this is not the case via datalogs of other people. And 99.99999999% of the time an intake will not throw a CEL or show any abrupt or drastic changes to notice and go "oh, well that's not good".

Our cars are MAF sensor based, meaning that the ecu is programmed to the stock intake and how much air the stock intake is pulling in. Without proper MAF scaling (tune) the car will be sucking in more or less air than it thinks or the MAF is telling it to compensate for in fueling. Just because you car seems fine, it really isn't. And slowly but surely you are working your way towards probably needing another shortblock.
Yeah it totally makes sense, just sucks to be losing the sound and doing the extra work. But I do not want to be causing major harm to a motor that still has less than 9k miles on it. Thanks for all the information!

Also, just to tack on, since you're learning. Your car doesn't have a "blow off valve".. it has a Bypass Valve. They're the same, but different. A blow off valve vents air to the atmosphere, getting it out of your intake system. A bypass valve does the same thing, but vents that air back into the intake plumbing, so you don't get any unmetered air. That's why people don't suggest aftermarket blow off valves :)
Thanks for the info, I actually looked this up the other day to see the differences.

I'm not totally mechanically inclined, I used to work on cars all the time, but until the STi I havent really gotten into it much in the past 8ish years or so. But any tips and knowledge is greatly appreciated!!
 

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That's awesome, glad to have someone with a lot of knowledge in the same town! Where abouts in Morgantown? I just bought a house over in the Cheat Lake area last year. Also thanks for the condolences.

I'm assuming it would not be advisable to keep the Perrin intake on a just schedule an appointment with the tuner you mentioned within the next week or so? As I do not drive the STi daily, my gf and I live together and work together so we mainly use her car.

As far as the exhaust, I do definitely need one as the stock is waaaay to quiet for my liking. I have mainly been looking at the Nameless 4" catback, but I am definitely interested depending on sound and price of everything. Thank you for all the information!
I live near downtown, I wouldn't suggest you leave the intake on, but I'd definitely suggest getting an appt for a tune ASAP, then you can throw it on no problem, as well as simple upgrades like an Electronic Boost Control Solenoid while you're at it. The nameless exhaust will be a ton louder than the SPT I have, but it's also around $1200. If you just want to swap exhausts I'd do like $300. PM me anytime, hope you're enjoying the car.

-Chad
 

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Discussion Starter · #18 · (Edited)
I live near downtown, I wouldn't suggest you leave the intake on, but I'd definitely suggest getting an appt for a tune ASAP, then you can throw it on no problem, as well as simple upgrades like an Electronic Boost Control Solenoid while you're at it. The nameless exhaust will be a ton louder than the SPT I have, but it's also around $1200. If you just want to swap exhausts I'd do like $300. PM me anytime, hope you're enjoying the car.

-Chad
That's cool, I work just across the bridge in Westover. I have taken the CAI off and now totally back to stock, I did email that shop you mentioned the other day, but have not heard back from them yet. What kinda options will the Electronic Boost Control Solenoid give me? Not sure what I want to do with exhaust yet, but definitely need something more aggressive than what I currently have. Car has been good though, cruised to Ohio and back this weekend to my uncles place, really got to test out the new radar detector and set cruise at 85 to and from lol.

I did get a new set of Rally Armor mudflaps (black w/red logo) and a set of DD license plate lights. Not sure what I wanna do next, possibly some more LED conversions, or Tail as Turn.
 

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So the stock boost control solenoid is only a 2 port and has problems controlling the boost when boost increased past the stock levels. A 3-port boost control solenoid gets rid of the restrictor pills and allows the wastegate to control the boost a lot more effectively. In result, the direct benefits from a 3 port ebcs is slightly quicker spool times, better boost control, and the sweet sound of wastegate flutter.
 

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Also, OP. I am located not to far from you as well. I live about an hour away from Morgantown. Right ourside of Cumberland , MD.
 
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