There arenít any that are particularly affordable. Like you, I also installed the Boss midpipe on my 2011. Gotta remember that the 2012-13 boss mustangs are ALOT less common than the 11-14 GTs. Therefore, supply and demand will apply. The difference in mid-pipes is literally just having the provisions for the side pipes welded onto them. Honestly, you might consider having flanges made and welded onto a GT midpipe by a muffler shop if you want to keep the side pipes. Will be cheaper in the long run. For me, I donít plan on installing long tubes as of right now so the stock Boss H-pipe is fine for me. We will see how it sounds with some cat-deletes I just picked up. Thereís no real gain in having the side pipes. Theyíre for noise and nothing else. Thatís why most Boss guys who swap exhaust just sell their sidepipes because if you go full exhaust, itís plenty loud.
2011 GT Premium 6-Speed
GO:S550 Longblock, Boss 302 Intake Manifold, Boss 302 Exhaust Cams, Airiad CAI, Boss 302 H-Pipe and Side Pipes, Borla S-Type Axlebacks
SHOW:GT350 20Ē Wheels, California Special/Boss Rear Spoiler, LED Marker Lights, S550 Style Headlights with HIDs