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Old 01-31-2005, 11:10 AM
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horsepower gain with this exhaust

Hello guys, long to no see

I had a question about my winter daily driver.

its a 1990 mitsubishi eclipse gsx, (turbo/AWD/5speed)

I am getting a custom turbo back exhuast made as i type right now, its 3". Its going to have a high flow cat, i can remove that later if i wish, but for now its gonna stay on. Going from a stock exhaust to this, any idea how much horsepower i will gain?
the car stock i think is 198hp, i have a k&N/moddified airbox (just enough to hold the filter on) and a manual boost controller.

Just wanted to get an idea of what to expect.

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Old 01-31-2005, 11:22 AM
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If you are making no other changes I expect it to drop. Not enough back pressure will cause a loss. Bigger is not always better. I remember when I was in high school. A friends brother ran stock cars. I thought they just used open headers. What I found out was they used headers with a 4 foot or so pipe the same size as the headers at the back. They cut it at a 45 degree slant toward the ground. They would cut 1/2 inch at a time until the motor made the best power. Usually ended up with around 3 feet. They needed some pressure for the exhaust to help scavange the headers out.
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Old 01-31-2005, 11:45 AM
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that may be for n/a applications, but turbos don't like backpressure.
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Old 01-31-2005, 01:12 PM
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hi a friend off mine has a subaru
with a 3 inch down pipe and exhaust this was a nice step up for hp (260hp with small mods)

martien
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Old 01-31-2005, 01:13 PM
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More than 1 hp and less than 100.

Keep the cat. You need it because the law says you need it. If its not clogged then it robs close to zero horsepower.

Almost any modifications that help the engine move more air in and or out is going to help horsepower. Do it because you want MORE power. Not because there is a HP figure attached to the modification. Thats just my opinion anyways. If you plan on keeping this car and continuing the modifications to make this faster, exhaust is always a good thing to start with. It will support, and help future upgrades.
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Old 01-31-2005, 01:49 PM
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im hoping i will notice a diffrence at least hehe
On a website for these cars, they have some performance steps, the first one is 280-300 crank horsepower, with my car that would make it run low 13's high 12's with a good driver it says.

Its a k&N air filter, boost controller, turning the boost to 16-17lbs (not much higher than stock) and a full exhaust like i have. Also a shifter and stuff, but if i can get 280 hp from what i have that would be sooo cool.
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Old 01-31-2005, 02:40 PM
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You might feel the difference in the exhaust. I did when I changed mine but that was on a totally different setup so I really cant compare.

If you can afford it, do it. Get the setup from a reputable company . . . see what other Eclipse guys are getting and what they have to say.

I am sure you'll enjoy it .
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Old 01-31-2005, 02:53 PM
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Cool, im accually getting it made right now, i will pick it up tomorrow night. Going to my ussual exhaust guy, been going to him for a while, always treats me great.
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