I have the duralast gold front and back. Never gave me any problems. The warranty is lifetime . I brought them at autozone. When my pads are running low I get them replace at no charge. Been using them for 3 yrs.
87 works fine with the 6's. The other octane doesn't do anything to the stang. Just wasting more money on gas. Also heard that 93 burns faster?not sure if that's true ?