Quote:
Originally Posted by serranot
There is a so-called "two-pipe" mod and then the so-called "ACM mod."
The two-pipe mod involves replacing two of the perforated pipes with solid and then welding together. The ACM mod replaces all the pipes; basically bypasses the resonance chamber of the muffler completely.
I did the two-pipe. One can go light on the pedal and it's completely quiet or get on it a little and make a bit more sound. No resonance either. Too quiet for some; I feel it has a great balance of improved sound and NVH with being respectful of others.
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Quote:
Originally Posted by TboneS54
I have the 4 pipe and it's perfection. Downshifts are brutal. At WOT, it sonds like a v8 F1 car. Cold start in the morning (echoing int he garage no less) scares the neighborhood. I want to delete secondary cats, but then it'll be too much. 2 pipe mod with primary or secondary cat delete would be perfect I bet, if you want to delete cats and tune for more power. I'm just after sound.
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Thank you both for the info!
Definitely more after sound than a bump in performance. As this is really going to be my daily when the new G80 comes, I also want to make sure that it will continue to pass smog here in California.