Had 72,xxx miles on the 5.0 F150, with a few mods already- CAI, JET Power-Flo MAF, Boss 302 intake, Flowtech shorties, Flowmaster FlowFX dual exhaust, and Bully Dog GT Platinum with tunes. The bump in performance with these and a set of NGK Iridium IX spark plugs was definitely noticeable. Worth the $
Definitely recommend this product for all 11-16 Mustang GT 5.0 owners, made a big difference in power, acceleration and helped save gas mileage and my garage don’t smell like carbon monoxide when i turn my car on, burns fuel and gases much better & cleaner. Lots of benefits. Great Job MSD Ignition.