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Originally Posted by Richard  I would put a 3 inch single pipe exhaust on a turbocharged 4 cylinder engine, especially if I was going to highly mod it. A Subaru WRX STI 2.5L engine is a good example, or a 2.4L Cobalt SS with a Hahn's Racecraft Turbo Kit is another. |
Very Very ture...3" is a perfect example for the cobalt SS with the 2.4L engine , because stock it's 2.5" untill it gets to the muffler then it goes down to 2.25, I had 2.75" straight through on mine from the 4-2-1 header exit back, which really helped with the low-end torque. with a turbo 3" would be perfect, when it comes out. the evo with the stroker kit is another good example
If the hahns turbo comes out next year for the 2.4L i think i might get it again. The cobalt was my first love and damn did that thing move. and it didn't sound like no chainsaw either...nice deep tone. It'll be my project car
