just ordered my LT's a few days ago and i am running a stock LS1 catback w/ a cutout in the ORP. im going to dyno my car next week before i put the headers on, then go back after i get em on. since i still want cutouts should i go dual cutouts on the y-pipe or single cutout before the axle? thanks for wny help.

 

on your particular car...probably lucky to get 2-3hp gains from dual cutouts...and more than likely a lose of low end