Here are a few i know of,there will be more manufactures im sure as time goes by.
Myself im waiting for a system thats worth its cost. 
Borla
Billy Boat
The H3 Source (sma system ?)
Stylinconcepts (magnaflow)
Teaka Toys (GLH System)
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It is a good thing for an uneducated man to read books of quotations. - Sir Winston Churchill
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