HKS Hi-Power cat back install
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This is a discussion on HKS Hi-Power cat back install within the Engine Performance forums, part of the Tutorials & DIY category; Just recently bought a hks hi-power cat back for my '05 wrx, and after researching similar threads i still have ...

  1. #1
    Registered User lordcon's Avatar
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    HKS Hi-Power cat back install

    Just recently bought a hks hi-power cat back for my '05 wrx, and after researching similar threads i still have a couple questions before installing:

    There is talk of a spring type donut gasket/flange thing that needs to be taken off the stock pipe in order for the hks pipe to mate to it correctly. Can anybody elaborate on this with pics if possible?

    Is a new gasket needed to replace the spring type donut when its removed? And if so, are new bolts needed?

    Anybody who has done a hks hi-power on a wrx themselves, input and comments please.

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    Yes there is a lead gasket that you need to remove just aft of the downpipe where the cat-back exhaust connects. You need to put another gasket there. The HKS exhaust comes with replacement gaskets. you should not have to change the spring bolts. Just re-use them. The HKS exhaust comes with all hardware for install. Installation for the cat back is about 30 min. with the proper tools.. Have fun. it's a nice sounding exhaust.

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    Registered User lordcon's Avatar
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    Quote Originally Posted by rfmbuddy
    Yes there is a lead gasket that you need to remove just aft of the downpipe where the cat-back exhaust connects. You need to put another gasket there. The HKS exhaust comes with replacement gaskets. you should not have to change the spring bolts. Just re-use them. The HKS exhaust comes with all hardware for install. Installation for the cat back is about 30 min. with the proper tools.. Have fun. it's a nice sounding exhaust.
    OK, so the lead gasket you are talking about is right after the cat where the hks hooks up to right? visualization:

    [hks muffler] [hks midpipe] *leadgasket* [cat] [downpipe]

    ?

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    Registered User lordcon's Avatar
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    did the exhaust install yesterday, took about 45 min. everything went perfectly.

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    Can anyone fill me in on if the HKS will work on 06 STi with the skid plate in the rear if I trim it or take it off. I looked yesterday and its only 4 bolts and the dam thing is only plastic.

    Nick

  7. #6
    Registered User lordcon's Avatar
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    Quote Originally Posted by DeViLs 06STI
    Can anyone fill me in on if the HKS will work on 06 STi with the skid plate in the rear if I trim it or take it off. I looked yesterday and its only 4 bolts and the dam thing is only plastic.

    Nick
    Assuming you take it off, the catback should fit fine. It wont fit with the skid plate there.

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