Exhausts myths and truths.

[andrave]

from a 2" with factory cat? defintely a big increase, from the dyno charts I'd say up to 20 hp is possible, depending on what you upgrade to...
and like the above post, faster spool up too.

[Jeff240sx]

Originally Posted by andrave

from a 2" with factory cat? defintely a big increase, from the dyno charts I'd say up to 20 hp is possible, depending on what you upgrade to...
and like the above post, faster spool up too.

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

[West]

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

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.

[ratm]

This is the thread off of Freshalloy http://forums.freshalloy.com/ubbthre...b=5&o=&fpart=1.