When you increase the power output of your Mustang, the engine is under more stress than what the factory intended it to be. ARP has created upgraded main cap side bolts to strengthen the engine main cap fastening.
ARP Main Stud Kit for Ford Mustang GT 2011-2020 5.0L V8 Coyote #156-5803
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ARP Main Stud Kit for 2016-2020 Ford Mustang GT350 5.0L V8 Coyote #156-5803
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