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It looks like if you want to use the same case just do it M5 style - cut the loops off that go back into the rear portion and block off that passage then throw the fiberglass packing back in in the back like the M5 unit and leave it out in the front section.
Give it a shot - all us 550 owners will be watching your progress as we are all looking for a cheaper alternative to using M5 mufflers or the high dollar European manufacturers that despite their high prices still drone.
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RIP: 2015 Black Sapphire Metallic 650i Gran Coupe, 343 Wheels, Michelin Pilot Super Sports 255 F / 285 R, M6 Front Grilles. Coming - M6 Comp. Mufflers, Carbon Fiber Diffuser & Spoiler.
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