Collector Bolts-Blk 1991-pontiac-firebird-esi6483971 providing increased strength and improved

providing increased strength and improved bushings

Roto-Joint lower trailing arms

Extended drain intervals over other brands due to higher quality base stocks and excellent dispersants

and then reuse

and precise fitment

Collector Bolts-Blk 1991-pontiac-firebird-esi6483971 providing increased strength and improvedPROFORM Wedge Locking Exhaust Collector 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