I say you take off the 4.4i badge and leave the x5 badge. I'd leave the same tips but if you have the money to spend on it then go ahead and change the exhaust tips to the 4.8is ones. otherwise just keep the 4.4i ones.

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RIDES
2005 BMW X5 4.4i Toledo Blue...RIP
Foose Edition S/C Ford F150 #0238
Chevrolet Trailblazer SS
Ford Mustang SVT Cobra