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Originally Posted by 06redsi
3'' is not too big for a NA K series, in most cases you wouldnt want 3'' on a na 4 banger but i have seen gains anywhere from 8-20whp from switching from 2.5'' to 3'' on NA K series, with proper tunning ofcourse. i gained a steady 5whp and 8-11lbs of tq all the way from 3000 to 8100 rpms so no i didnt loose any power because of the 3'' pipe.
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I don't want to start a fight here, but 3 inch is WAY too big for this car. If , for arguments sake, you did gain wheel horsepower with your Exhaust, then with a 2.5 inch setup, you would gain even more. Regardless, your 3 inch exhaust would Maybe give you power up top but completely eliminate the little bottom end you have. Thats great that you think the K20 is special and needs a 3 inch, but its a waste. A three inch is too much for most turbo cars. Let alone a 2.0 N/A motor with NO TOURQUE