I second Borla, especially since you're in areas that have salted roads. I had Borla Stingers on my 06 and have had Borla Touring on my 07 since I threw the old Flowstoppers away that were on it when I bought it in 2014.
One of the hangers broke on my axle back, and I contacted Borla. They asked for the usual, receipts, address, contact informations, etc and pictures of the mufflers. Within two weeks, I had a new set of Borla mufflers shipped to my door at no cost to me.
That kind of service is second to none, and I'm a lifetime Borla customer now after having dealt with nightmares from warranties with other companies.
2007 Mustang GT 5-speed 3.31 gears, Hidden Hitch Receiver, Barton Short Throw, JBA LTs, Borla Touring Axle Back, and Lito tuned SCT X4. BMR SP009, KYB Shocks & Struts, J&M CC plates, J&M LCAs. 4 Piston Brembos
255/45ZR18 front 295/40ZR18 rear
Department of Boost GT450 with 2011 GT500 M122, TB, & CAI | 13/14 GT500 HE & IWP | GT500 dual pumps | FRPP 52lb | CMS Stage 2 Blower Cams | Comp Springs & Retainers | AEM boost & wideband | 8 rib conversion | Track Spec GT500 Vents