HKS Downpipe Review!
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This is a discussion on HKS Downpipe Review! within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Well, I WILL have one here...I'm getting it installed tomorrow so I'll have a full review here then FIRST IMPRESSIONS ...

  1. #1
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    HKS Downpipe Review!

    Well, I WILL have one here...I'm getting it installed tomorrow so I'll have a full review here then

    FIRST IMPRESSIONS

    Pictures: http://www.imagestation.com/album/?id=4291521857

    The installation took a little longer than we all had suspected, because there was already a car on the lift at Garage SPL being worked on, so they had to do the installation on the ground. Matt (the mechanic) noted that it was hard to reach the end of the stock downpipe that attached to the cat-back from a ground install, but eventually he got it out. After getting it out, he found out that my 02 sensor was cross-threaded and wasn't sure if it got damaged or anything. He was able to put it into the new downpipe just fine though.

    After the install, Alex (my buddy who works there) turned it on and wow was it loud. My cousins and I went for a test drive and immediately noticed that it REALLY smells! Oh man! Does that smell go away, or at least become not as strong later? I sure hope so. In any case, we also first noticed a really loud sucking-air sound, a lot like what a short ram intake sounds like, but coming from under the car rather than in front of the passenger's seat. Perhaps it was a leak? Not sure...hopefully someone with a cat-less downpipe can shed some light on this one.

    Later on, after doing some family stuff, I finally went for a test drive with my cousin. Here's a short video of us pulling out:

    http://www.folkendesign.com/wrx/downpipe.wmv

    It's definitely a lot louder, and it should be noted that I didn't go WOT at all in the video...probably 60% max. I had to turn my boost down since it spiked up to 1.16 bar. I also noticed that with my slushbox, it didn't shift as smooth anymore, but maybe my unichip just needs to be tuned for that. I'll be getting my unichip tuned tomorrow morning with my Blitz SUS getting put back in, so we'll see how that goes

    Otherwise, the throttle response is incredible now, and the couple times I did go WOT it just kept pulling...I hit about 55 mph in a 35 by accident coming home from my cousin's house because the throttle was so much more responsive now. I'll have more to say tomorrow after my unichip is tuned

    OH YEAH...and no CEL so far
    Last edited by Verdugo; 08-06-2002 at 10:30 PM.
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    Registered User gryphon's Avatar
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    Re: HKS Downpipe Review!

    Originally posted by Verdugo
    Well, I WILL have one here...I'm getting it installed tomorrow so I'll have a full review here then
    Darn you! You tricked me into reading this post!

    I'm getting mine Friday. I'm thinking of getting a wastegate dump tube welded onto the flange, too... hmmm....
    2002 Subaru Impreza WRX
    Midnight Black Pearl

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    I'm planning to get it next week.
    I heard that it will cause CEL.
    I know there is a fix for it...but there are couple CEL fix out there.
    Which one is the best?
    and where can I find it?
    thanks.
    -soul

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    Originally posted by soulsweeper
    I'm planning to get it next week.
    I heard that it will cause CEL.
    I know there is a fix for it...but there are couple CEL fix out there.
    Which one is the best?
    and where can I find it?
    thanks.
    -soul
    No clue on this one
    Armin - ClubWRX Admin/Moderator since 2002
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    Registered User Nexus6's Avatar
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    Arnt they going to make an uppipe as well?
    La Fee Verte
    Subaru 2002 Impreza WRX Sedan

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    Re: HKS Downpipe Review!

    Originally posted by Verdugo
    Well, I WILL have one here...I'm getting it installed tomorrow so I'll have a full review here then
    Excellant dude. Btw I didn't see the bell mouth design like the OEM one. I guess for the price it is great
    What mods, dude this baby is stock
    2002 Platinum Silver 5spd sedan.

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    Registered User gryphon's Avatar
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    Re: Re: HKS Downpipe Review!

    Originally posted by WRXrumble


    Excellant dude. Btw I didn't see the bell mouth design like the OEM one. I guess for the price it is great
    OEM isn't bellmouth... it's exactly the same way (flat flange)
    2002 Subaru Impreza WRX
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    Re: Re: HKS Downpipe Review!

    Originally posted by WRXrumble


    Excellant dude. Btw I didn't see the bell mouth design like the OEM one. I guess for the price it is great
    Yep, I'm pretty much going to be happy with my mods for awhile after this is all completed (in other words, no bigger turbo in my near future) so this should suit me just fine
    Armin - ClubWRX Admin/Moderator since 2002
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    Btw I just found this to get rid of CELs

    http://www.ponyexpressperformance.co...liminator.html
    Armin - ClubWRX Admin/Moderator since 2002
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    Registered User WRXin''s Avatar
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    Re: Re: HKS Downpipe Review!

    Originally posted by gryphon
    I'm thinking of getting a wastegate dump tube welded onto the flange, too... hmmm....
    Okay...so I'm still learning: What does a waste gate do?

    As for the downpipe, how hard is it to install? I didn't see any instructions on scoobymods. Anyone have them? I'm going to install my up and downpipes at the same time since I heard it's a hell of a lot easier that way. Let me know if you guys think other wise. Thanks.

    Fahd
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  12. #11
    Registered User gryphon's Avatar
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    Re: Re: Re: HKS Downpipe Review!

    Originally posted by WRXin'
    Okay...so I'm still learning: What does a waste gate do?
    The wastegate is a pressure release valve inside the turbocharger that opens when a preset pressure is reached. This way your engine doesn't blow up.

    As for the downpipe, how hard is it to install? I didn't see any instructions on scoobymods. Anyone have them? I'm going to install my up and downpipes at the same time since I heard it's a hell of a lot easier that way. Let me know if you guys think other wise. Thanks.

    Fahd
    It's not very hard.

    Remove the intercooler
    Remove the turbo heat shield
    Unbolt the downpipe from the turbo
    Unbolt the downpipe brackets
    Unbolt the downpipe from the catback.
    Unbolt the downpipe from the "hook" it rests on.

    That should be about it.
    2002 Subaru Impreza WRX
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  13. #12
    Registered User WRXin''s Avatar
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    Thanks a lot gryphon. This sounds simple enough. I'll let you know how it goes. Laterz.

    Fahd
    Fahd

    Floats like a butterfly and stings like when I pee!

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    i didnt take my intercooler off when i put in my new downpipe
    free food is the best food

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    Hey I got my HKS downpipe already!!!! it comes in black color, has o2 bung, and its lighter than PDE when I lift it. Downpipe is going in two weeks (cash flow problems lol)

    so if verdugo can review and tell me about the CEL issue I really appreciate it
    Attached Thumbnails Attached Thumbnails hks dp 002.jpg  

  16. #15
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    one more showing the O2 bung
    Attached Thumbnails Attached Thumbnails hks dp 003.jpg  

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