TTI Exhaust Systems

I'll be doing the same thing to my 66 dart - only I ordered the TTI ssytem to fit up to the stocker manifolds. I figure I can get the car running and drive it to the shop for the shorty header install and the down pipe fabrications - save a little dough not having it flat bedded since the car is not running yet. PLus I can break the motor in myself. I bought the h pipe 2.5inch system as well. My car will be running a 300-350 hp 328ci (60 over 318).