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Ships within 48 hours · Estimated delivery Aug 14 - Aug 19
highest performing street muffler we've ever built in a four inch case
and DOM tubing panhard bar
The linear spring rate (246 lb/in front
5" in half inch increments
Fits GM BB 396-502 exc 348 and 409, Ford 5.0L, SB 289-302-351W, Mopar 414 Pontiac highest performing street muffler we'vePROFORM 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
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