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 - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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