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Old 05-25-2010, 06:38 PM   #1
Goodfellow
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Default HKS highpower catback

So I just purchased a HKS highpower catback, Kinda big for my taste but it should do for now. It came in two peaces and does not have any gaskets at all. I got it used. Does anyone know if this will bolt right up to the stock DP (Down pipe) and what gaskets I need for the mid pipe and down pipe?

Thanks in advance, Cody.
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Old 05-25-2010, 06:43 PM   #2
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EDIT: It should mate up. Take out the donut gasket.

See the second DP to the right? That circular thing coming out the bottom end is the donut gasket. I just comes off.


I have the same exhaust except it's a TBE. It sounds ok, but I'm waiting to mod my RSR
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Old 05-25-2010, 07:53 PM   #3
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You'll need two 3 inch two hole gaskets.
Example: http://www.grimmspeed.com/catalog/pr...products_id=62
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Old 05-30-2010, 01:54 PM   #4
Goodfellow
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Yes but my hks highpower is 3'' all the way back, wont I need a 3'' Down pipe aswell to mate up correctly?
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Old 05-30-2010, 03:19 PM   #5
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Not exactly, there are ways to mate the flanges together
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Old 05-30-2010, 05:05 PM   #6
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Quote:
Originally Posted by Goodfellow View Post
Yes but my hks highpower is 3'' all the way back, wont I need a 3'' Down pipe aswell to mate up correctly?
no you dont, just the gaskets. Ive had mine on without a downpipe for like 6 months and it works fine. just got my hks bellmouth so thats changing soon
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Old 06-03-2010, 09:00 AM   #7
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So I got it all on last night. The two bolts holding the DP on to the catback blew apart. Apparently there is a spring or something. I used two random bolts and some washers grinded the hold Gasket off. Put the Mid pipe on the DP hung it, tightened the two bolts that I had to get washers and the sealer ring. Leaks like a F***ing siv. I dont know if I need a donut gasket, if those two bolts that sealed it just suck. If I need those springs on. IDK IDK all I know is its taking 40% of my sound away.
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Old 06-03-2010, 11:02 AM   #8
happs subi
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Did you throw them away? Those are there to allow a bit of movement in your exhaust, you definitely need to buy new ones.
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Old 06-03-2010, 01:51 PM   #9
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The spring bolts allow the exhaust to move slightly when using the donut gasket.
The stock donut won't work with the HKS CB though. You need a 3 inch 2 hole flat gasket.
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Old 06-04-2010, 09:26 AM   #10
Goodfellow
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Where can I get some 3-2 inch. and If I put the spring on, wont it leave a huge gap in between the two exhausts?
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Old 06-04-2010, 09:33 AM   #11
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Its never going to work right. The stock DP is a donut style, while the HKS is a flat flange, meant to bolt up to another flat flange. Even if you manage to mash it together with bolts, it will eventually leak again. IN the picture above, you would want something similar to the DP on the far left.
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Old 06-04-2010, 10:15 AM   #12
WRBlueGDB-F
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Quote:
Originally Posted by Goodfellow View Post
Where can I get some 3-2 inch. and If I put the spring on, wont it leave a huge gap in between the two exhausts?
Try ImportImage Racing. He has the best prices around on the Grimmspeed gaskets.

Quote:
Originally Posted by Drowner View Post
Its never going to work right. The stock DP is a donut style, while the HKS is a flat flange, meant to bolt up to another flat flange. Even if you manage to mash it together with bolts, it will eventually leak again. IN the picture above, you would want something similar to the DP on the far left.
Mine worked fine for a couple of years.
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