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Ok guys, this is why I suggested using a calculator.
If you put in your engine specs AND RPM it will tell you an optimum. There is also an entry for horsepower.
IF you put in your specs, put it at the rpm you want on the highway, and tell it how much horsepower you are making, it will compensate and tell you the proper diameter. If you only ever plan on making 30 hp at 2k rpm, then fine, install a 1/2" exhaust.
I run a 2.5" exhaust even though it recommended 3" for max power. Why? I switched it around to a 2500 rpm rangine instead of a 5000 rpm since i plan on towing.
Result? Just under 2.5" exhaust. On a civic or something smaller, you don't tow. But your rpms are right around there.
Lets face it, the EASIEST way to SIMPLIFY the exhaust situation and keep it IN COST is to just do a simple catback in the same diameter pipe that factory has, but straight throguh.
Any mufflers = disturbed airflow.
turns = disturbed airflow.
Just take it from the cats and run it out.
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