From Arrow Special Parts comes exhaust systems for the 2011 Honda CRF450 and CRF250. The exhausts feature a silencer that is designed to match the bike frame. From the news release:
Its design has been taken from the Trophy silencer from Arrow, and it is made with two sections, welded together: the shape and design allowed us to reduce the overall lenght of the silencer and to place it below the right side fairing, reducing the weight and the dimensions of the exhaust: with respect to the original system, weight reduction is around 40 percent. Silencer shape (coupled with some technical details, with materials and a purpose-designed dB-killer) made it possibile to keep down the noise within limits required from presentregulations both national (Italian Federation) and international (F.I.M.). Silencers have a built-in carbon endcap, this too has been derived from the one used on Trophy silencers.
Contact: Arrow Special Parts SpA, +39-075-861-811, www.arrow.it