Bert Smith is my local dealer and where I purchased my 335i. In five and a half years of ownership, I have been to their service department 5 times and never had any issue with them. To be fair, I have never had a warranty claim with them through the years though.
My water pump failed out of warranty, and they performed the HPFP/Injector recall on my car when I brought it in for its 'every two year free brake fluid service'.
Based off conversations I have had with my service advisor at Bert, I believe they are more concerned over ECU tunes than anything else. Suspension and exhaust mods I think will go unnoticed by them.
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Montego Blue / Saddle Brown / Gray Poplar
6-speed Manual (CDV-free) / BMW Performance Exhaust / Dinan Intercooler / Dinan Stage 2 / Dinan Cold Air Intake
BMW Performance Suspension / Dinan LSD / 19" Forgestar F14s / Front and Rear M3 Bushings & Arms / Rear Sway / Dinan Monoballs
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