i deed do the same thing with mi m5 e39 i change the original x-pipe to straight pipe and i lose the deep sound (the sound was like the old american cars) and i lose some back pressure

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[/IMG]Daddy daddy, whats that car with that huge spoiler, and white lights in the back?.....
Thats X5 son and he just kicked my ass! :
2006 X5 4.8IS
2001 M5 individual
2004 TVR Tuscan S 2004
2004 Mitsubishi Evolution 8 MR