is a custom exhaust good for a 3.0 a4?bad?
07-21-2002, 05:30 PM
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The 3.0 has a butterfly (maybe two?) valve somewhere in the system...
like the EXUP Valve on Yamaha motorcycles that manipulates packpressure. Make sure you figure out where that is in the system, and what the impact of removing it might be.
07-22-2002, 11:27 AM
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Really? More Info?
I know they have VVT on the exhaust valves but this is the first I heard about "manipulating backpressure"
Do the butterflies switch to a different diameter pipe? I've always understood pressure drop by itself to be a bad thing, but pressure drop due to smaller diameter pipes can be a good thing if it helps scavenging.
Do the butterflies switch to a different diameter pipe? I've always understood pressure drop by itself to be a bad thing, but pressure drop due to smaller diameter pipes can be a good thing if it helps scavenging.
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