(4) Gaffrig 4.5" mufflers, $550
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I have no idea, they work just fine. Three of the mufflers are S/N 4685, one is S/N 4701. I bet Gaffrig can answer your question though...
http://www.gaffrigperformance.com/Pr...SubCategory=11
http://www.gaffrigperformance.com/Pr...SubCategory=11