i'm thinkin of getting one, but i'm not sure if it'll void my warranty. better check up with the dealer. bloke from rockhampton got it installed to his x5 and he was very impressed.
i dont think you'll be dissapointed with power figures they're claiming, 180KW 525NM of torque!!!! yeehah!!

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05 X5 3.0D, Sapphire black
20" Style 177
2x12" Shallow mount Subs
DiceBox