Quote:
Originally Posted by Megahurtz
True it is 2.75" but it is also a true X pipe and not the crappy stamped style the factory uses although neither would be a cause for drone. Must be that I have no secondary cats. And it is very minor but perhaps the RPMs that the A8 are in a cruise make it more pronounced.
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I don't have the secondary cats either, so perhaps it's the A8/M6 rpm range
The crappy stamped style X is good enough for the ZL1 it's good enough for me. Don't really see any actual performance benefits to an aftermarket X.