Not sure if this is old news, but Ford has a CAI, throttle body and tune
kit that gives 479hp and 438tq on the Mustang GT. For $1295 seems like a nice upgrade with factory warranty. Notably +42lb/ft at 2000 rpm. Wish Chevy would offer the same deal for the LT1. A base Mustang GT is around $35k + $1295 for the performance package seems like good bang for the buck with a warranty.
https://performanceparts.ford.com/part/M-9603-M8B