Whats up guys? I got a question, got a buddy whos going to be doing a engine swap and wants to basically know what muffler would be best. right now hes considering the Corsa db 4", or a Magnaflow 4". so question has anybody on here used the corsa db 4" and if so howd you like it? also what other 4" mufflers are you guys running and how do you like them? thanks