need some help with experienced dyno guys
i was wondering if there is really a huge gain on a stock ci, internal motor between a catted y and a catted td setup.
on they y i would have cats and a single sweet thunder dumped, would that be a good setup
and on the td would be catted td with dual sweet thunders
and also, would you guys get it dyno tuned or would a mail order tune be sufficient enough?

