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Originally Posted by Jeff240sx
Alex on Fresh Alloy ran a 3" turbo exhaust on a 180k miles NA KA motor with simply an air intake. He gained 14 horsepower and 9 ft/lbs of torque. At some points, gains of up to 20 rwhp. Not a loss in torque from the sizeing anywhere. He just said its loud. But for dispelling myths, this is a whale! ADD A 3" EXHAUST TO YOUR STOCK KA FOR 15 HORSEPOWER!
-Jeff
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Sure it was a Stock KA? IIRC Alex had just about every bolt on there is. Or im thinking of another Alex.
I plan to get the RSR Ex-Mag 3" and run it NA until I get my turbo. Its suppose to be a quiet exhaust, so I will see. I hate loud exhaust to begin with.
If your exhaust isn't big enough then you are creating unwanted backpressure on your compressor, causing turbulence. Your turbo wont spool as efficiently.
Bottom line, backpressure is our enemy. On NA cars there is a happy medium. IMO you wont notice the loss of low end torque if you run a 3" exhaust on your NA KA.