Current have a Scoobysport Back box on my MY00 and want to tweak it a bit more. Thinking of either a new downpipe or midsection but not both as I want to keep one of the cats to be on the safe side but I'm not sure which option is going to give the biggest gains. Looking for a bit more torque and better throttle response.

Grateful for any info


AllanB

 

Downpipe will give bigger gains, especially if it has a 'full size' aperture.

However, midsection cat alone will not pass emissions unless *very* hot.

Do both