As said. 300.00 in labor costs to install axlebacks is a lot of money, considering it is a relatively easy job that anyone can do, once the car is elevated a foot or so on jack stands, ramps etc. Good luck with your mods, but don't let anyone bamboozle you as to what it takes to put them on. Replacing mufflers on a 2011 and up Mustang doesn't get any easier. And when just replacing mufflers, you do not need to alter the tune. Just my .02
2011 GT. Grabber Blue. Procharged. 3:73 manual.Billit LCA's. Corsa Extremes. GT 500 wheels. Racemaster DR's. T-56 Tremec. Dynotech DS . Centerforce DF. American Racing headers/high flow cats 560 rwhp.Donny Walsh tuned
2012 Pony Package. Race Red.3:31 automatic.BBK longtubes and catted X.FRPP Sport axlebacks. BBK throttle body. Dynotech DS. Brembo wheels and tires. Strut tower brace. Airraid CAI. Bama tuned.