I am a new member and I have a 2003 E53 X5 3.0 with Auto Trans with normal spring suspension in all four corners. I would like to upgrade to a factory Sport Suspension. Is it possible to duplicate the factory installed Sport Suspension by changing the springs, shocks and struts? If so, where would it be best to acquire them and who would be best to install them? I have factory five-spoke aluminum wheels with 235/65R17 104H Michelin Lattitude Tour HP tires. Should I stay with these tires and wheels; upgrade to 255/55V17 tires, or equal, using the same wheels or should I change the wheels and tires to 18- inch similar to the ones that comes from the factory? Thank you in advance Millard
