XB08 Extremeblaster Tunable plates fitting Extremeblaster 4" exhaust pipes and Supertrapp diffuser disk type 4" mufflers 6) holes each disk (not Supertrapp original equipment). Actual disk measurement is 3-13/16" outside diameter and 2-3/8" inside diameter standard size for 4" disk type mufflers.
Stainless steel construction Set of 6 total. 
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