Thread: is back pres. good 4 NE thing?

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This may be controversal but here goes:

An engine needs absolutely NO back pressure to run right. If an engine runs better with mufflers, the primaries are too large/small or the collectors are too large/short. The engine is all about scavenging and when the pulse hits a pressure difference meaning larger pipe or atmosphere, it bounces a wave back to the exhaust creating a pressure difference promoting scavenging. If the exhaust isn't "tuned" to the engine's specific needs, it could use the back pressure to help low end waves but it will cost top end hp. If you tune the exhaust to the engine, it will run better all the way around without back pressure.