i started buying some 3" parts and what not and then this guy who is currently building a 67 COBRA said its a bad idea to have 3" from the turbo back. he said there wont be enough back pressure for the turbo to work properly. is this true or should i keep buying 3" exhaust parts. next winter id like to build the bottom end so i can turn up the bost....but for now will 3" exhaust be bad ?