Quote:
Originally Posted by GTIanZ28
For some reason I was thinking it was before the muffler. (Which makes no sense at all.)
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You might have been thinking of these guys:
Which, I believe, are light spring-loaded butterflies which close when the engine switches down to 4-cyl mode, to provide a bit of backpressure and perhaps to eliminate some drone due to AFM. I think all of the V8 exhaust systems have these, not just NPP.
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