It does run better that way. I had a 406 sbc p/u that I built the dumped 3" exhaust for , I got a wild hair and took it to the muffler shop and had them ran up and over and out behind the wheels , like a camaro. I could tell the h.p loss when I started it to back it out. I rodded it a lot going home and pulled them off, still laying in the barn if someone wants them !! 3"