The 304 silencer is recommended for most two-stroke applications. The slightly longer body offers added top end performance while reducing noise output. The brushed aluminum body and stainless steel inlet tube and end-cap gives you a silencer that looks as good as it performs.
KTM SX 250 17-18 EXC 250 300 17, Husqvarna TC 250 17-18 TE 250 300 17
