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Old 07-15-2002, 10:00 AM   #1
Tim Smith
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Question Not your typical exhaust question

Has anyone taken out the entire exhaust from the headers back and replaced it with dual short pipes into a glass pack inline muffler that exits infront of each of the rear tires? Think about a Shelby cobra. I had this sort of thing on my escort and it was the best for horses. (I did have an aftermarket header of the scort though.)
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Old 07-15-2002, 12:29 PM   #2
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there was a picture of a GC8 floating around here with what you're describing somewhere a while back....
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Old 07-15-2002, 12:51 PM   #3
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Talk to Challenger1 of Changer Deep(Shawn Gilson) he is in the process of getting a set up like this for the old school and new school Imprezas. He is on the board so you could shoot him a PM or email him at tech@challengerdeep.com

Buster
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Old 07-15-2002, 01:02 PM   #4
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Like this?

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Old 07-15-2002, 02:38 PM   #5
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That is exactly what I had in mind. It sounds like nothing else and you can have whatever length primaries on the headers that you want. You can get great raises in torque and not sacrifice in the top end. Plus it looks great.
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Old 07-16-2002, 01:03 AM   #6
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that car looks amazing
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Old 07-16-2002, 01:37 AM   #7
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Whose car is that and do you have a site link or e-mail address???
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Old 07-16-2002, 02:25 AM   #8
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The o2 sensor will be fuxored
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Old 07-16-2002, 09:08 AM   #9
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havent i read that because of the funny firing order, dual exhaust like that wouldnt get the proper scavenging effect.


short exhaust infront of the tires is cool though
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Old 07-16-2002, 09:57 AM   #10
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Quote:
Whose car is that and do you have a site link or e-mail address???
If you notice that's a Ver 4 GC8 WRX. Its been featured in a couple of brittish car magazines (I think I saw it in "Fast 4's" or "Hot 4's" or something like that). The owner apparently had problems finding a muffler that would quiet the car down enough to avoid the po po... ever hear a WRX without a muffler? Sounds bada$$ and not very loud (all things considered) so I can only speculate how obnoxious an RS would be.

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havent i read that because of the funny firing order, dual exhaust like that wouldnt get the proper scavenging effect.
Because its a WRX he has a header/uppipe, downpipe, and a y-pipe to make the dual outlet so he gets the proper scavenging BUT he has to used flattened (oval) piping to ensure ground clearance (probably the same stuff they use on the F-body camaros and firebirds). I can say this, for N/A performance, the MRT design header is your best bet but it doesn't leave a whole lot of room for this kind of exhaust setup. A Borla makes squat for power but would leave a lot more room in the midpipe for an inline (Borla Bullet style maybe) muffler.
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Old 07-16-2002, 10:08 AM   #11
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Yes and no.

It doesn't matter how the cylinders fire as long as it is one than the other (has to be or the crank would just vaibrate itself to pieces). I would think since the engine is so smooth that the cylinders have to fire every 180* (4 cylinders, 360* rotation, 2 rotations for 4 cycle motors). Then you just match the primary header lenth to put the negative pressure wave from one cylinder right were the high pressure from the other cylinder would be. It is an easy concept but hard to figure out without trial and error. But that is the beauty of this system. It couldn't get easier to make the headers.
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Old 07-16-2002, 11:24 AM   #12
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For some reason a magic # 52" is popping into my head for max primary length. I have experience with MRT exhausts and would suggest that if you do go with dual side firing exhausts that you use a crossover pipe right after the primaries collect just like MRT. I'm not sure how you would do the o2 sensor configuration. It is used to detect missfires so putting it in the exhaust stream of only one bank of cylinders would render it only half effective.

Brad
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Old 07-16-2002, 02:16 PM   #13
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52" Is a lONG primary. I an thinking more and more that I would like to do an X connection some where in the line and put the O2 there. For nothing else than else of installation.
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Old 07-16-2002, 02:28 PM   #14
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I know a guy with a Legacy Wagon that did a side pipe/glass pack exhaust just like that.

I never saw it but he's told me about it many times. BTW he has the 2.2L motor...

It's loud, WAY loud. And he ripped it off his car driving over some railroad tracks.

NC
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Old 07-17-2002, 10:00 AM   #15
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Quote:
Originally posted by BOY
Like this?

that exhaust is made by Hayward & Scott, the car is nick-named "Dark-Angel" and is featured in the UK mag. Banzai.
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Old 07-17-2002, 11:54 PM   #16
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That was me, with the 2.2 legacy. It was WAY loud, Put harley's to shame. Kills the low end but man its like a turbo at 4200 rpm. Now I love loud cars, I have no stereo, and no sound deadening material, but this got anoying if you weren't full throttle. Very raspy at first, (granted a loud raspy) and then onto space shuttle loudness. It sucks to have as a daily driver, It KILLS low end power. Not to mention if your car is lowered, The mid section will scrap on speed bumps and other sorts of rises. Especially train tracks on richmond expressway. Twice. to be exact. Now for a track day set up. Can't think of a finer setup, until the officials site you with a noise violation. Borla has some really thin mufflers. Nobody carries them because they a re so small. Must people put them on pro-7 cars for turn downs. They are in the catalogue under XR-1 series. Youll need two to keep the low end. It will still be loud, But they won't burn out like glass packs. 2-3 month life expectancy on the packing for glass packs.
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