These Mid Length Headers for 302 and 351W FOX chassis Mustangs use the same flange as our Long Tubes and the same collectors. The only difference between a Long Tube Header and a Mid Length Header is the length of the primaries. They are less weight, they cost less, and they can easily be installed from the top of the engine compartment. They can be run as-is (for race cars, with open headers) or you can have any muffler shop connect the collectors to a full exhaust system for street cars. The 1 3/4" and the 1 7/8" Mid Length Headers have 3" collectors, and the 2" Mid Lengths use a 3 1/2" collector. We have all out drag cars running these headers. Racers like the fact that they weigh less than Long Tubes or Front Exit headers, and they do not get in the way of transmission swaps, clutch replacments or converter changes. The actual horsepower difference between Long Tube Headers and Mid Length headers is minimal, you may lose 6 to 8 HP with the Mid Lengths compared to the same primary size Long Tube Headers (we have done dyno tests on this). And if you are running a full exhaust system with mufflers, the HP difference is less than that.
RCI Custom Headers