I have 3.0i 2002 with stock ugly exhasut tips. i was thinking to get on of 2 options,here are links:

ACS tips:
eBay Motors: ACS EXHAUST TIP FOR BMW 3,5,7 SERIES E36 E46 E39 E38 X5 (item 180342101020 end time Apr-29-09 20:56:37 PDT)

Or this type:
eBay Motors: BMW E53 X5 2000-2006 Chrome Exhaust Pipes Tips x2 (item 380111178908 end time Apr-15-09 16:09:37 PDT)

Any suggestions? Will sound stay same? Anyone have one of them installed on 3.0i ?