BORLA 400287 ProXS™ Muffler, Dual / Dual, Oval, 2.25" 19" x 4" x 9.5" ymm_41 F-100 1977-1979

F-100 1977-1979

Borla Cat-Back and Axle-Back exhaust systems feature patented straight-through and multi-core technology to help increase exhaust velocity

BORLA premium-quality exhaust tips feature mirror-polished high quality T-304 austenitic stainless steel

250˝ Thread Diameter-Pitch 5/16-18 Grip Diameter 5/16˝ Wrenching 3/8˝ Head Height 0

Specifications Socket Size(s) 19mm 12pt UHL 4

BORLA 400287 ProXS™ Muffler, Dual / Dual, Oval, 2.25" 19" x 4" x 9.5" ymm_41 F-100 1977-1979Description BORLA 400287 ProXS Muffler, Dual Dual, Oval, 2. 25" 19" x 4" x 9. 5" The ProXS Muffler features a 2. 25" dual inlet and 2. 25" dual outlet, with a 4" x 9. 5" oval body measuring 19" in length and 24" overall. Un notched necks are designed for weld in installation, and 3" wide band clamps 18003 are recommended if clamping is preferred (clamps not included). This muffler includes an internal X Pipe to enhance performance and sound, and its