FMF SST 2 Stroke Exhaust Pipe: The SST pipe increases mid range pull and extends the over-rev considerably while sharpening the off idle throttle response. No other pipe on the market can offer these same type of gains or offer the same linear power delivery that the patented SST brings to the table. # FMF Racing s Tru-Flo stamping process ensures a perfect fit and optimum performance. # Chrome plated for everlasting appearance and durability. # SST Module is the brain behind this pipe.