Quote:
Originally Posted by GOLDCYLON
Concur. I would have had em coated as well but that might have been stealth enough for CA
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Bingo
I'm also considering dually out with a pair of conventional tips because the best way to make these c4's stop resonation from the back hatch area seems to be stopping up dual outlets to a single one...like Corsa's do and GM as well with the factory fake 2nd outlet. I think it's about time to figure out how to get the NPP valve hooked up on my car. Also very likely will go to some quieter muffler type as mentioned in my first post.
The main question I have on GM's NPP system is what controls the valves to open up at roughly 3500 rpm besides low manifold vacuum? If there is electronic control, how do you adapt it to older cars?