Can anyone suggest a good exhuast system to fit to my 1995 Lancer GSR. Obviously i want the most horsepower gain i can get without doing to much and a nice bassy sound.

Any suggestions would help and an approximate HP or KW gain would be good also.

Cheers

 

i would go with a 3"from turbo back. it may not be perfect but it will give big hp jump and will be sweet for almost any turbo you decide to put on later..... i would deff go for it.... as for gains i know that rexies get about 20kw gain and 200sxs get about 25kw gain not sure if its atw or fly but ether way ita going to make a big ***ing diff.... thats just my 2 c any way, if you want a deep note perhaps get a resinator???

 

Have you performed any mods yet? If so what? This will change the answer, but if it is stock I feel a 2.5" will be best as going to something like a 3" will cause you to loose backpressure and actually loose performance. Now say if you had a bigger cooler, upped the boost, with even a piggy back ecu then I would say 3" without a doubt.

 

That power figure is usually at the wheels for the WRX's and 200SX's..

And Mivec, i have found that turbo's prefer a free flowing exhaust, more then a back pressured exhaust.. thats what NA cars need really, wouldnt you rather your compressor spinning more freely ?

 

Havent done anything to it yet, still stock as they come upart from the wheels. Had to keep it that way for insurance purposes.

 

I agree with rexhunta... Backpressure is to stop fresh air and fuel from flowing in the intake port and out the exhaust port during the overlap period... But this only occurs in NA cars, because the turbo will always create some backpressure (You've got a flipping big turbine sitting in the pipe!)

It is possible to get too big an exhaust for a turbo however... The reason for power loss though is for different reasons. It's that you lose exhaust velocity. Air has momentum. When you force it down a thin pipe, you create a area of low pressure behind it. This low pressure then helps the turbo keep spinning and the exhaust keep flowing.

If you have too big a pipe, the exhaust just moves slowly, cools down in the pipe and causes a further obstruction for more exhaust coming out.

So there is a compromise point somewhere... In answer to the original question, 3" is safe if you're intending to up boost and power later. If not, I'd go something smaller. I have a 3" mandrel bent exhaust on a Evo VI putting out 150Kw ATWs, and I believe there's more growth left in it before I go any bigger.

 

Sorry everyone I am shaking my head now, I was thinking along a different line to what I was writing. I was thinking exactly what Sunder said in regards to it being too big and the gasses not moving fast enough. I can't believe that I said backpressure, sorry guys, WTF was I thinking.

I still think 3" will be too big, to start with, unless you have bigger plans in mind.