Z running 14-16 psi, 2.5 inch piping all the way (custom exhaust) pretty much all the bolt ons out there... but i still got my cats on... i ran in without cats for about a week and it felt faster! then i installed my "custom" exhaust with 2.5 piping ,the cats! (emissions) :( , X-pipe.... this thing sounds AMAZING! u can hear the VG tone with a little turbo whistle but its not so loud, it just sounds perfect, the huge X pipe resonator gives it a great distinct sound too.. so now i got a friend that can help me with emissions, so the cats are not a problem anymore! MY QUESTION IS HOW MANY HORSES CAN I GAIN IF I DELETE MY CATS? like i said sock turbos stock motor and pretty much all bolt ons out there. HP GAIN?
little help so i can decide what to do... i just love how it sounds now! but if stight pipe will gain me a descent amoun of power i guess ill deal with the loud noise! :)