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Old 09-27-2001, 11:42 PM   #1
Scooby Newbie
Member#: 10291
Join Date: Sep 2001
Location: Rice Town, Florida
2002 Impreza WRX
WR blue pearl

Default Pipe sizes

I've seen some piping sizes for the mazda Rx-7 to be around 4 inches and it is a turbo charged engine. The biggest piping i've seen for the wrx is 3 inches. If I plan on adding a much bigger turbo in the future will the 3 inches be adequate enough? how wide is a good up-pipe? Thanx for any help you guys can dish out.
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Old 09-28-2001, 07:00 AM   #2
Scooby Specialist
Member#: 4268
Join Date: Feb 2001
Location: San Jose, CA
2002 WRX Wagon
WR Blue Pearl


Well, 3" isn't the largest, there are plenty of brands that offer 80mm, which actually equates to something around 3.2" That is what Imprezer is running on both his Syms/Cusco system and now his Bozz Speed system. Actually, Bozz now makes a 90 mm pro system if you really want bigger, but the 80 mm should be just fine for most people's needs. Besides, RX-7s may use those 4", but do you really want that 100+ db in your ear all the time?? 80mm is plenty to flow well at 400+ hp.

As for the up-pipe, you want to keep the factory diameter (I believe it is 2 1/4"). A bigger diameter up-pipe will reduce exhaust gas velocity going into the turbo. A sudden change in pipe diameter will also introduce turbulence and additional back-pressure. Shiv's up-pipe is a good option!

Mike S.
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