i am looking to add a body kit to my 3.0 2003 black X5,,, should i get the 4.6 or a aftermarket body kit?? also where can i find a good deal on the 4.6 body kit.

Also , can i add a 4.4 exaust to my 3.0 , or at least make it add a dual to make it look better, more like the 4.4