2.500" ID x 6" Long Flex Coupling (Interlock Liner) 304 Stainless F-3R-121 the F-4X represents a massive

the F-4X represents a massive collaborative effort to develop a system that is capable of 4000+ HP

5" stroke is 12" compressed and 16

• Optimal strength to weight ratio

• Lower control arm mounts with multiple hole locations

• 1″-14 RH threads

2.500" ID x 6" Long Flex Coupling (Interlock Liner) 304 Stainless F-3R-121 the F-4X represents a massiveThe Ace Race Parts brand of 100% 304 Stainless Steel Interlock Liner style Flex Couplings are great for reducing vibration and stress in your exhaust system. Our Flex Couplings feature a 304 Stainless braided exterior, a 304 Stainless interlock style internal liner, a flexible 304 Stainless bellow in the center, and 304 Stainless end caps. The interlock style internal liner helps provide a smooth flow for the high temperature exhaust gases passing