Every 318 iv owned (quite a few) has been straight piped none of them have been over bearing loud. They have all been single pipe with manifolds. Is there any performance benefits in a straight pipe ( no muffler at all) or does it hurt performance? Iv heard that no muffler hurts performance and can damage valves etc is any of that true?
As long as there is enough piping to keep atmospheric pressure away from the exhaust ports. That's what would be bad. 14.7 psia is atmospheric pressure. a=absolute That makes for lousy exhaust extraction. :eek:
If you want to think about it from a combustion point of view; look at it from the two parts of the exhaust cycle. the first part being the pressure from combustion being released and the second from the pumping of the piston.
