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Depends on which one you get. Someone sells a complete replacement X pipe that's the size of the L99 resonator section. It's a bolt on, IIRC. You can also get a magnaflow true X pipe and have a shop weld it in.
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2010 Black 2SS/RS A6
Halltech CF 102 fed
GPI modded intake manifold
Bo (knows) White ported TB
Kooks LT's/ Dynomax VT
Pfadted (springs/sways)
Dyno tuned by Rhino and GPI
I once parallel parked a train.
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