Downpipes, uppipes, etc help?

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02-03-2003, 02:04 PM

stockWRX2002

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Downpipes, uppipes, etc help?

Hey, as you can probablt tell, I'm new here, I previously owned a 1999 Honda civic Si, and made the switch to a 2002 WRX. I love my choice! Anyway, I wanna make my exhaust more efficient, I was thinkin Carbon Ti, and I am confused about up and down pipes. If I get a downpipe, is that similar to a Honda test pipe? Also, Is it good to replace downpipe and uppipe? Does HKS make a good down and up pipe? Thanks

02-03-2003, 02:50 PM

Sonic1

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If I am right the Honda test pipe was used to replace a cat on the Honda exhaust system. Check this link out it will probably help you.
https://www.i-club.com/forums/showth...&threadid=7443

02-03-2003, 05:37 PM

jcme262

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If you have the money do the whole thing up/turbo back, cat backs dont gain enough alone.

02-04-2003, 11:41 AM

stockWRX2002

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I was thinkin up pipe, downpipe, and cat back (but there will be no cat due to up pipe? ) or turbo back, but is there a Carbon Ti turboback? They cost so much too . . . . .well does HKS make a a good up and down pipe?

02-04-2003, 12:08 PM

Wingless Wonder

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Car Info: 02 Impreza WRX sedan

Quote:

Originally posted by stockWRX2002
I was thinkin up pipe, downpipe, and cat back (but there will be no cat due to up pipe? ) or turbo back, but is there a Carbon Ti turboback? They cost so much too . . . . .well does HKS make a a good up and down pipe?

The factory up-pipe contains one catalytic converter, of a total of three in the WRX exhaust system.

I don't know anything about HKS parts for the WRX. I notice that a lot of WRX owners use parts from companies that feature WRX mods as a big part of their business. Off the top of my head, companies that come to mind for exhaust are Perrin, TurboXS, Vishnu Performance, and Cobb Tuning.

Even though the basics of performance tuning and handling still apply to the WRX, it is a different type of animal from your Honda. For instance, a common first performance mod for Hondas is a cold-air intake. This mod isn't quite as universally accepted among WRX owners - it's an ongoing debate. I also don't see as many mildly modified cars with strut tower braces.

"You must unlearn what you have learned." - Yoda

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02-04-2003, 01:42 PM

LE4bangerR

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if u get a catless downpipe doesnt it remove 2 cats?

02-04-2003, 04:02 PM

Wingless Wonder

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Quote:

Originally posted by LE4bangerR
if u get a catless downpipe doesnt it remove 2 cats?

Yes, I was only referring to the up-pipe. Replacing up-pipe and downpipe will remove two cats. Check out this nice exhaust diagram.

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"...axles of evil..." - George W. Bush

02-04-2003, 04:20 PM

BlueDemon

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Quote:

Originally posted by LE4bangerR
if u get a catless downpipe doesnt it remove 2 cats?

It's actually a misconception of the word "downpipe" A pipe like the BOSAL which only replaces the factory DOWNPIPE, is an actual DOWNPIPE. A pipe like the Perin, which removes both the factory downpipe and the factory MIDPIPE are not actual downpipes, they are more of a combo down/midpipe. For the sake of business companies are simply calling both types "downpipes"

Blue

OH, to answer your question though..... for the sake of performance, I would not go with the HKS "downpipe" (will be referred to simply as a downpipe for the sake of reason) nor the HKS uppipe. Both are not of the greatest quality, nor does the downpipe have a Bellmouth. So in effect, the only thing you are doing is switching out a pipe that is basically the same design as the factory downpipe, but removing two cats.

Go with something that has a bellmouth, and/or separate wastegate pipe.

I went with the PDE uppipe, and the Bosal Twin Dump Downpipe (yes, it is an actual downpipe) I opted to leave the factory midpipe in, because it doesn't impede airflow by all that much, and it still gives me that 'environmentally friendly' look.

:rollseyes:

Hope this helps

Blue

Last edited by BlueDemon; 02-04-2003 at 04:30 PM.