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no, back pressure is bad almost always
..."Cars need [in many cases, for optimum use] back pressure"...
engines ?
do not need back pressure in the exhaust , less back pressure is always better (except during decel)
which is one reason some users of
engines
use
headers , to minimize and or completely eliminate exhaust back pressure at certain
designed for rpm / load conditions
but
on decel
back pressure in the exhaust is irrelevant OR desired for braking purposes
and the engine intake has high vacuum during decel , so it would be easy to use vacuum to switch a valve to direct exhaust flow to spin an alternator
during decel only
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