KLR650 '84 - '07 The Q4 employs intricate chambers, baffles and proprietary multistage packing material making it the best performing quiet muffler availableConstructed from aircraft grade aluminum and high strength stainless steelSound rating 96dBMuch lighter than the stock muffler Choose Year Gen 1 (KLR650 '84 - '07) Gen 2 (KLR650 '08 - '18) Ships same business day $449.95