18psiWhiteMS3
Banned
- :
- 2009 MazdaSpeed3
how does it perform in this configuration?? the stock cat back does not look that restrictive to me. is it? how does the cobb sound??? any videos or sound clips?? i think im going to do the cobb downpipe and stock cat back just like the trurboxs stealthback. are the gains good on the cobb downpipe?
