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Fits 1970-1991 GMC Jimmy Chambered Muffler SF42453-JHPR shut-off-valves 7 V8 1980 - 1985Street Flow, 3 Chamber Performance Muffler, Moderate Tone, 16 Gauge Aluminized Steel, Premium Powder Coat Finish, 2. 25" Offset In, 2. 25" Offset Out, 3 Year Limited Warranty. Features: Handcrafted Chambered Mufflers Installer Friendly Design With Unpainted Ports 16 Gauge Aluminized Steel Construction High Heat Premium Silver Powder Coat Finish North American Made Product Moderate Tone Specs: Body Length (IN) 17 Body Type Oval Finish High Heat Premium