From your profile it seems like you are in
Arizona, why not just go to Mark Basch at
Basch Acura Service? (602) 244-8010.
His shop specializes in NSXs, why trust anyone else?
BTW: I have been quoted $320.00 to $640.00 to install a coilover kit in the Bay Area. Service here is kind of expensive, $85.00 an hour in labor.
According to the Comptech site it takes about
4 hours to install the springs.. Not 6 as your dealer quoted...