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McKenna is the most mod friendly. While Richard is mod friendly, Crevier being a Penske dealer, and the shop foreman are incentivized by BMW to look for mods on every car.
If you have any powertrain mod McKenna is go to. For just cosmetic / chassis mods Richard at Crevier will take care of you.
I don't have too many experiences with Irvine.
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BM3, MHD, ECUTek Calibrator | N55/S58 specialist | 2023 X5 45e Frozen Marina Bay Blue
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