I have a 1986 chevy C-10 , 400 sb 0.040 over headers , th-350 , HEI MSD coil , there was 2 1/2 turn down pipes on it but i was wondering would it do me any good to go to 3"b/c the way i was going to do the exhaust was like the old shoe box novas (exits right behind the rear tire but you dont see it) with cut outs on it and where can i find a trans cross member that loops up so i can hide the exhaust?Nother thing is i have a 2.73 in the rear right now and was wondering if the 3.55 i have help or hurt me ? I want the truck to perform , dont care about the sinkin gas prices!!!One more thing when i run the motor for a few mins the beather on the valve cover has a mosture likesteam coming out , would that be the head gasketyou think?thanks for all the help