Quote Originally Posted by 1978chevy View Post
I got a '78 chevy pickup 4x4 350 headers, the exhaust I have on the truck now it 2.25 pipe from the headers back to glasspacks then turned out in front of the wheels, somebody told me that if I put a x pipe in it and maybe a different muffler that it would improve my horsepower and low end torque, if so how much would it help
It might help, but nothing you would even notice unless you did a before and after pull on a chassis dyno.......