Funny so did I..... :) I would have gladly had someone install Aero mufflers on some of the Ambulances I hired employee's to drive. I was a director in an ambulance co. that put 100k+ miles a year on each of the 20 ambulances. $30k a year just in fuel, per rig.....save me 10% or $3k per ambulance = $60k a year savings for a 4k investment. see what I'm getting at.....