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Old 09-21-2003, 04:29 PM   #1
Scooby Newbie
Member#: 41411
Join Date: Aug 2003
Location: Kansas City, MO
2004 WRX Sedan
Java Black No Spoiler!

Default For an aftermarket downpipe and cat back on do you need to reuse the stock donut?

The rubber donut that goes between the stock downpipe and catback.

I forgot to put it on my HKS downpipe and catback. Do I need it? I don't notice any leaks right now.

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Old 09-21-2003, 04:40 PM   #2
*** Banned ***
Member#: 16615
Join Date: Mar 2002
Location: Huntington Beach
I ♥ my TE51
2009 Nissan 370z


No, don't need it for the HKS system.

There are only a few downpipes that use the stock donut, like the Stromung DP and cat eliminator combo, and the PDE downpipe.

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Old 09-21-2003, 05:57 PM   #3
Scooby Specialist
Member#: 16318
Join Date: Mar 2002
Chapter/Region: NWIC
Location: Kirkland, WA
2002 WRX Franknwagen
Grime over Sedona Red


...and ProDrive DP and 3rd pipe.
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Old 09-21-2003, 09:02 PM   #4
John Wayne Toilet Paper
Member#: 7327
Join Date: Jun 2001
Chapter/Region: NWIC
Location: Seattle, WA
2008 Mazdaspeed3
2006 Wrangler Sport


and the scoobysport
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Old 09-21-2003, 09:35 PM   #5
Sunrise City Rider
Scooby Specialist
Member#: 1503
Join Date: May 2000
Chapter/Region: South East
Location: Sunrise, FL, USA
2000 Impreza W"RS"X
Blue Ridge Pearl


If there is a flange for a donut gasket, then use it...The downpipes that replace both cats do not have that type of flange...

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