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Borla Atak Axle Back Mufflers

Borla Atak for 11'-12' Mustang Boss 302 part# 11791 vs. Borla Atak for 13'-14' Mustang Boss 302 Part# 11838, does anyone know what the difference is? I have an opportunity to purchase 11'-12' Borla Atak part# 11791 on the cheap but my car is a 13' Boss 302, they look identical but Borla says the 11791 will not fit on the 13' Boss 302. I find that hard to believe since other manufacturers are offering common mufflers for 11'-14' mustangs. Has anyone done this before?
 

Grant 302

basic and well known psychic
The tips are a different length.

IIRC, ‘11-‘12 parts are shorter and that it’s wuite noticeable when parts are used on the ‘wrong’ body style.
 

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