Quote:
Originally Posted by JCL
A larger diameter, to reduce restriction and flow more. That assumes you need to flow more; the standard exhaust isn't particularly restrictive IMO. If you combine a larger diameter exhaust with free-flowing catalytic converter and a free-flowing muffler, you can gain a few hp. Wouldn't be worth it (hp/$) but it is technically possible.
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I agree with everything JCL has said, but just be careful when putting a too large of an exhaust. The car (if an automatic) still needs back-pressure for the torque converter. This *could* be the reason why TowX had to tow in lower gears because there wasn't enough back-pressure for the torque converter.