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21021HKR 4 21021HKR
4" Sidetube Slip–In Mufflers
Super Competition 4" Sidetube Slip–In Glass Pack Muffler; Sold In Pairs.  
21002HKR 4 21002HKR
4" Sidetube Slip–In Mufflers
Super Competition 4" Sidetube Slip–In Muffler; Sold In Pairs; All Metal Small Block Reverse Flow Design 
21003HKR 4 21003HKR
4" Sidetube Slip–In Mufflers
Super Competition 4" Sidetube Slip–In Muffler; Sold In Pairs; All Metal Big Block Reverse Flow Design 
21046HKR 4 21046HKR
4" Sidetube Slip–In Mufflers
Maximum Flow 4" Sidetube Slip–In Muffler; These high performance mufflers produce an average of 23% more power than open headers 

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