one shop tell me they do not want to install for me because of safety issue. true?

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2002 Siena Red, Beige Leather, Light Poplar Trim 3.0i X5
Premium Package, Xenons, Cold Weather Package
Rear Climate Package
-Alumimum Running Boards (done)
-19s OEM Style 63 (done)
-Titanium Grills, Tailgate Handle, Mirrors Retaining Rings (done)
-Aluminum Pedals, Footrest, Handbrake Handle(done)
-Clear 04+ Tail Lights, Sidemarkers (done)
-4.6/4.8 Exhaust (bankrupcy)
GO TERPS, GO REDSKINS