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Old 02-05-2013, 01:08 AM   #10 (permalink)
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Join Date: Jul 2009
Location: New York
Posts: 513

no nickname , it's just a car - '04 volkswagen golf tdi
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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
headers , to minimize and or completely eliminate exhaust back pressure at certain
designed for rpm / load conditions

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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