Info from a David Vizard article states that to support 570 hp a muffler will need to flow 625 cfm @ 1.5 hg or 20.3 inches of water on a flow bench, and so will the tailpipe.
If a motor dyno’ed at 500 hp with open exh then two mufflers that flow 550 cfm will keep the hp loss to about 5 hp.
To equate to open pipe hp of a motor the whole system , collector to end of the tailpipe will need to then flow 2.2 cfm per hp.
A pressure wave terminator box will make everything down stream appear invisible to the motor, but the minimum volume is 8 Xs that of one cylinder up to a max of 15 Xs.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
Last edited by steve25; 02-26-2026 at 09:08 AM.
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