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Designed to reduce back pressure
this noticeably lighter-than-stock link pipe features a resonator in the middle part and removes the secondary set of catalytic converters
Traditionalists will appreciate the strength and functionality of ARP’s heat-treated 8740 Chrome Moly steel alloy bolts
Superior material grain flow because of patented Wave-Loc surface design as compared to knurled bolts that have sharp edges and “built-in” stress risers
Fits Following Engines: Buick V6 & V8
ARP 611-4000 SAE Bolt Kit 1/4-20 x 4.000 12pt SS bolts ymm_20 Designed to reduce back pressureSpecifications Socket Size(s) 5 16 12pt UHL 4. 000 Thread Length 1. 000 Grip Length 3. 000 Thread Diameter Pitch 1 4 20 Grip Diameter 1 4 Wrenching 5 16 Head Height 0. 255 Collar Diameter 0. 515
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