Sad to say that I sold my M550IX, happy to say I bought a new M5 comp!
Dinan V2 Tune: Paid $2100 installed by dealer, this would be warranty covered, let your dealer install. I must say it was a SOLID gain and the M5 is an ANIMAL, but the M550 with the tune was not THAT far off with the tune versus the M5 comp.
$1100.00
M Performance Floor Mats: Fronts only $100.00
668M Wheels with Conti DSW All Seasons: AMAZING upgrade form my 19's. I had the 669M wheels that I just sold but these rode super smooth for 20's. Tires are OEM SPEC to dealer. 275/30/20 rear & 245/35/20 with 95% tread... $3,000