Fits GM BB 396-502 exc 348 and 409, Ford 5.0L, SB 289-302-351W, Mopar 414PROFORM Wedge Locking Header Bolts ELIMINATE the need to constantly re tighten collector bolts, and without the need for clips, pins, racing wire, chemicals or gunk. The secret is in the Wedge Locking Washer's super hardened external teeth that "bite" into the bottom of the bolt head and the top flange surface. Vibrations that normally cause other bolts to loosen, are blocked by the wedge locking action that uses tension, instead of friction to stay

single chamber mufflers

In addition to our popular U-J Bends

and a CNC machined and hardened stud

as well as SAE 30 and SAE 10W30 motor oil

the heavy-duty panhard bar increases rear stability

FORD M2C931-B/-C

PROFORM is a registered trademark of Specialty Auto Parts USA

The S-Type Cat-Back(tm) system delivers a balanced

By eliminating the stock-ford ballast resistor

On cars that are lowered significantly

When under heavy load (acceleration) the rear springs will compress

UMI a-arms are supplied with both sets of mounting sleeves to accept either hardware sizes