this guy from work who has built a few SC 65-67 COBRAs said that putting 3" exhaust from the turbo back would be bad for my car. He said there wouldnt be enough back pressure and the turbo would not function properly. BEFORE i continue with buying 3" exhuast shit is he right. I plan on buildin gthe block to run higher boost so i do wanna plan ahead but will this be BAD until then?