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Old 10-20-2006, 08:22 PM   #1
markreda
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Join Date: Jun 2005
Chapter/Region: E. Canada
Location: Toronto, Canada
Question Exhaust Bypass Valve?

Would one of those "Exhaust Bypass" be a performance improvement on a 02 WRX?

I don't know the correct term for the exhaust bypass I'm reffering to.
It looks like a "Y" pipe that replaces a section of the exhaust after the cat and allows the exhaust to leave the system before the resonator & muffler.

Does anyone know the correct name for it?
Or a manufacturer?
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Old 10-20-2006, 08:43 PM   #2
wrxdrvr
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Chapter/Region: W. Canada
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'09 STi 297.5 WHP
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Exhaust Cut Out...atpturbo has one and QTP, and badlanzhpe has one.
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Old 10-20-2006, 10:15 PM   #3
SINthetic
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03 WRX
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Old 10-21-2006, 11:51 AM   #4
markreda
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The one you suggested is a complete downpipe.
Anyone know of an exhaust cutout that can be inserted anywhere in the exhaust? Ideally I'd like it to terminate behind the driver (now I'm just being picky).
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Old 10-21-2006, 02:52 PM   #5
wrxdrvr
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As was suggested QTP has one, you can get without the down pipe...ATP has one http://www.atpturbo.com , and badlanz has one http://www.badlanzhpe.com/ You just need to look.
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Old 10-21-2006, 06:32 PM   #6
nitro
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1990 BeeGTR BN32R4
Red

Default exhaust dump

I got one from summit racing and fabed it up myself, I could dig you up a picture if you want. I used a perrin DP (cattless) and right before the pipe bends up towards the back of the car I cut the exhaust pipe off, welded on a 3 bolt 3" Flange, bolted the dump on and put an angled piece below that to protect the butterfly flap, and make the pipe flush to the ground, just a little bit higher than the subframe.

Then just above the valve I welded in a 2 1/4 (same as stock) and wraped it around and welded it back inline with the stock exhaust just before the second cat.

I like summit racings because the valve is variable the amount that you can open and close it to make it a little louder or screaming.

One problem is I have a wideband o2 just above it and I think that there is too much velocity and It f*cked up my sensor. Either that Or it's my BOV making the car backfire after I shift and It burnt my sensor. I'll find out as soon as I put a new one in.


Almost forgot

I find that the bypass helps performance, because you can have it closed to give you bottom end torque, and open it up to give you 0 backpressure for up top.

As well I go from 13PSI to 15.5PSI when I open it up (I also have perrin's boost solinoid)

Last edited by nitro; 10-21-2006 at 06:39 PM. Reason: forgot
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Old 10-21-2006, 06:40 PM   #7
nitro
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oppss
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Old 10-22-2006, 12:38 AM   #8
onesixnin
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09 Tribeca
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I have mentioned the cutout here on this site. Take a look at the mccord powerplate. It is not nearly as pricey as some of the other ones. The quality it there. Different switch and lighting options. Sometimes it does *feel* as if it has more power from it, but I have not tuned my car at all. So really, I probably lose low end grunt, maybe gain some quicker spool and everything in between is probably thrown off from lack of tune (I get hesitations sputters etc). However, the sound is unbeatable, you can make it quiet, and is a lot cheaper than a full turboback.
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