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Bigger tires
E90fleet, (sry if I got that wrong), you may be right about changing tire size in the ecu. I didn't bother. I DID replace my RFTs with General Alimax R43 255/45 R19s. Taller wider non run flat tire that has improved the ride for the GF. I haven't noticed any change in performance but then I don't drive it very hard. When my speedo says 65mph I am actually going 66.7, not a big deal to me and the back tires will rub (barely) if I hit a bump that bottoms out the suspension. Did that once, I've had the tires on for a year. Still want to raise the suspension a bit, love exploring the outdoors and some of the dirt roads I have taken were slow going...
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