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Have you tried just removing 2nd cats and resonators and add x pipe? Hell of a lot cheaper, reversible, and retain use of flaps. Everyone who's done it loves it. Just a thought.
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'07 Yamaha R1 (sold)
'06 C55 AMG (sold)
‘?20 M5, MP Carbon Pro Spoiler, MP Carbon Diffuser, MP Black grille and gills, MP Carbon Mirrors, CF side sills, 789M w/ Ti studs, eventuri, Dinan X pipe
'14 X5 50i (wife’s now)
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