it went off pretty smoothly.
i inquired about what it is actually doing to the vehicle, and the service guy wasnt much help. apparently they had only done one prior to mine. its all new to them too...as in theyve only known about this for the last couple of days. but i finally spoke to a mechanic and he thought that it was serving to delay the gear change from 3rd to 4th, but i put to him maybe it was from 4th to 5th since thats where the problems were reported. so sounds like higher revs. didnt really notice any difference in revs on the way back, but then i was in rush hour traffic so didnt really get a chance to let it out and see how it went through the gears.
the letter didnt give a range of vin's, just my specific vin. but it did say only 05 and 06 mdx's.
05 MDX Touring Silver
02 Porsche 996 Carrera C2 Cab