How Does This Work?

chromebumpers

chromebumpers

solid fixture here in the forum
Staff member
I’ve seen exhaust pipe ends with plates over the outlets. There is a slim gap letting some exhaust out, but doesn’t that create back pressure? Isn’t this contrary to everything we do for MORE performance?

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Appear to be Lake pipes, or copy. Are the caps not typically removed when one wants to exclude the muffler(s) from the equation?
 
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electrical exhaust cut outs are generally used and the exhaust block plates removed when the exhaust cut outs are open,
the lake pipes side exhaust are for looks only and generally not used if the cars street driven
 
I don’t think we’re on the same page. I see these pipe ends on Cali cars and lots of older bikes like 40s and 50s Indiana’s
I never saw any electrically operated cut-offs on the bikes and I’m sure these capped off pipes was the sole exhaust system on the 1950 Lead Sleds. I seem to remember the exhaust ends had multiple end plates used to adjust the sound?
 
yeah I see those on BIKES that don,t have other mufflers occasionally
they reduce the sound, by reflecting sound waves,
but the baffles DON,T HELP performance,
unless you use a very long/ big thick stack of spaced baffles,
so the combined area of the exit spaces between the baffles of the exhaust is greater,
than the exhaust pipe cross sectional area from every test I ever saw
 
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