whats the difference between a straight pipe and a custom x-pipe ..ive have put a straight pipe on (taken out resonators) making it sound vicious and seems a little bit more responsive...but ive read on the forums that some have installed x-pipes someone please tell me the diff and which one would be better? and would the x-pipe take away the growl...
also where can i find the best angel eyes for a 03 4.6
i have them installed on my M but the guy at my shop said they dont make them for a X5 or that they dont look good!

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MY GARAGE!!

2003 X5 4.6is
2002 M3 droptop smg
2001 Ducati 996
1967 Camaro SS