The muffler is there to quiet the engine and is a restriction, and restrictions limit HP,, period. The reason a short pipe might make more HP than no pipe is not back pressure but quite the opposite. Exhaust out of an engine is not steady flow but pulses and a pipe of the correct diameter and length will take advantage of the pulses timing them to provide a scavenging effect that lowers pressure the port. I have never seen any evidence of valve warping from short pipes as a matter of fact I once ground an exhaust valve true and repeatedly heated it red hot and let it cool in open air and it never warped. It didnt even warp when I threw water on it, I call that one BS too. Racers are the biggest bunch of monkey see monkey do types you will ever run across and I dont doubt that some of themc over headers thinking they are preventing valve warpage. However the original reason for covers on dragsters with zoomie headers was to keep the hot sticky tires from picking up gravel and debri and pitching it in the headers when they were being towed back the return road. They also keep things out of the headers that others might throw in there AND they provide protection for the body when working over them.
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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