1) only if it comes with the special order Star Spoke 87 wheels - I believe 2001-2003 4.4i Sport came with V spoke 63 (9''/10") as standard - both sets are 19" wheels - 2004-2006 standard setup was non-staggard 8.5 x 18" all around (acouple different wheel types) - afew have complained about uneven wear, but both my 2001 (V spoke 63) and my 2006 (Star spoke 132) so far have shown remarkably even wear

2) I have no experience

3) my 2001 4.4i Sport with Dinan exhaust actually quiets down as you pickup speed, but gives awesome sound off the line and when downshifted

hope that helped

__________________
Mark _______________________________
2001 X5 4.4i topaz blue/sand Sport, complete Dinan S2 , hitch, V1, tint, BSW Stage 1, Alpine INA-W910BT
___________
Life is not fair!
You can't protect people from their own stupidity!
Laughter makes life worth living