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How bad of an idea would it be to go stage 2 with stock CBE? The only mods I have at the moment are the K&N filter panel and AP Stage 1. 2004STi. I figure a DP is my next step because it fits my budget much nicer. Would it hurt to go stage 2 after that or would I just not realize the true output potential? Too much back pressure?

I'd like to hear the concerns or endorsements from you more advanced guys. I'm no tuner by any means, just a guy who wants to play the upgrade game safely with considerations for engine damage and PA emissions.
 

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How bad of an idea would it be to go stage 2 with stock CBE? The only mods I have at the moment are the K&N filter panel and AP Stage 1. 2004STi. I figure a DP is my next step because it fits my budget much nicer. Would it hurt to go stage 2 after that or would I just not realize the true output potential? Too much back pressure?

I'd like to hear the concerns or endorsements from you more advanced guys. I'm no tuner by any means, just a guy who wants to play the upgrade game safely with considerations for engine damage and PA emissions.
That is 100% fine. All you need for Stage 2 is to remove 1 cat and reflash. The axleback doent make a difference besides for sound.
 

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Discussion Starter #3
That is 100% fine. All you need for Stage 2 is to remove 1 cat and reflash. The axleback doent make a difference besides for sound.
How bout high flow cats? Not sure I'll make it through emissions if I remove any. I kinda like the idea of keeping the car looking stock and I definitely don't need any more attention drawn to me.
 

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How bout high flow cats? Not sure I'll make it through emissions if I remove any. I kinda like the idea of keeping the car looking stock and I definitely don't need any more attention drawn to me.
You have two cats after the Turbo, you should remove both and replace them with ONE high flow cat. I have one HF cat and I passed NY emissions which is OBD-II scan AND a probe up the tail pipe to check actual emissions while the car is idling.
 

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Discussion Starter #5
You have two cats after the Turbo, you should remove both and replace them with ONE high flow cat. I have one HF cat and I passed NY emissions which is OBD-II scan AND a probe up the tail pipe to check actual emissions while the car is idling.
That's the info. I'm looking for. Pretty sure PA tests are the same way. Thanks!
 

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That's the info. I'm looking for. Pretty sure PA tests are the same way. Thanks!
Yea you should be set. Enjoy flashing to Stage 2.
 

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Discussion Starter #7
Yea you should be set. Enjoy flashing to Stage 2.
It's gonna be a while yet, but at this point Stage 1 is still amazing me. Had a 335i driver so mad at me this morning before rush hour because he couldn't lose me on the highway.
 

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It's gonna be a while yet, but at this point Stage 1 is still amazing me. Had a 335i driver so mad at me this morning before rush hour because he couldn't lose me on the highway.
hahha nice. 335 is a nice car, but the STI is almost $20,000 cheaper (when you fully load the options on a 335)
 

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That is 100% fine. All you need for Stage 2 is to remove 1 cat and reflash. The axleback doent make a difference besides for sound.
Actually, that's not true. The stock WRX axleback is quite restrictive. It will make quite a difference if you are really trying to make good power on a stage 2 car (read: protune).

However, I'm guessing you plan to use an AP, you can surely run the Cobb stage 2 OTS tune without many problems.
 

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Actually, that's not true. The stock WRX axleback is quite restrictive. It will make quite a difference if you are really trying to make good power on a stage 2 car (read: protune).

However, I'm guessing you plan to use an AP, you can surely run the Cobb stage 2 OTS tune without many problems.
Ive run a Stage 4 with the stock axleback and with an aftermarket. The difference was less than 10whp. Nothing you would ever feel. The requirements for Cobb, UTEC and EcuTek stage 2 is a reflash and cat deletion, it does not require a new muffler.
 

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Ive run a Stage 4 with the stock axleback and with an aftermarket. The difference was less than 10whp. Nothing you would ever feel. The requirements for Cobb, UTEC and EcuTek stage 2 is a reflash and cat deletion, it does not require a new muffler.
+ 1
also the sti axelback is like a quater of an inche bigger than wrx one
 

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would it be worth it to put an STi cbe on a wrx if you want an exhuast without putting 600 into something worth 10hp?
 

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would it be worth it to put an STi cbe on a wrx if you want an exhuast without putting 600 into something worth 10hp?
Restriction wise? Its a bit better im sure. Sound? It is louder.

I would download audio clips if I was you. I am *not* a fan of the STi muffler on a WRX, it sounds like metal rolling around a tin can (no idea it sounds so weird).
 

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this is probably a stupid question, but what if you just take the cat-back off and just have an aftermarket downpipe?
 

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Ive run a Stage 4 with the stock axleback and with an aftermarket. The difference was less than 10whp. Nothing you would ever feel. The requirements for Cobb, UTEC and EcuTek stage 2 is a reflash and cat deletion, it does not require a new muffler.
Hrm, I find that very hard to believe. Did you have the car retuned after you replaced the axleback?

My '06 WRX gained around 30 wtq and 20 whp after I slapped on a better flowing axleback. I did, however, retune it specifically for the axleback.

The STI axleback does flow quite a bit more (read: around 40% less backpressure) then the stock WRX axleback, there are some good flowtest results floating around nasoic.
 

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Hrm, I find that very hard to believe. Did you have the car retuned after you replaced the axleback?

My '06 WRX gained around 30 wtq and 20 whp after I slapped on a better flowing axleback. I did, however, retune it specifically for the axleback.

The STI axleback does flow quite a bit more (read: around 40% less backpressure) then the stock WRX axleback, there are some good flowtest results floating around nasoic.
Well I have an 05, so 2.0L. But the stock axle back robbed less than 10 whp. I find it very hard to believe you gained 20 whp from a muffler. A Turboback exhaust in general only gives you 25 whp over a Stage 1 reflash.
 

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Discussion Starter #18
this is probably a stupid question, but what if you just take the cat-back off and just have an aftermarket downpipe?
Not sure I understand. You're saying aftermarket DP with nothing the rest of the way back? Unless you route that exhaust somewhere I'm thinkin you've got a good chance at poisioning yourself. The other thing would be a very annoying loud boxer rumble busting your ear drums.
 

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i figured i would give it a try for a day or two haha. I dont think it could be that bad, but after a bit i will end up putting the stock cat-back on.
 
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