Home > Moto Parts > Yoshimura Home > Moto Parts > Yamaha R9 Parts > Yoshimura AT2 Stainless Full Exhaust The highly anticipated Yamaha R9 is finally here and Yoshimura has developed an AT2 Speed Series system with profound results. Utilizing their AT2 muffler and ISC technology they've been able give the Yamaha R9 the legs it needs to perform. Removing 4.5lbs pounds of weight is nice advantage that comes with the AT2 Speed Series. Performance on with AT2 Speed Series system provide more horsepower and torque throughout the entire power spectrum. In fact you can expect up to 3.37% HP gain @10,000 RPM and a 4.1% torque increase @8,300 RPM. Now the R9 has longer legs! Yoshimura's Integrated Sonic Chamber allows us to boost power over the stock unit and gives the R9 extra bark all while keeping the new Speed Series full system 49 state friendly. Aesthetics and sound are second to none when it comes to Yoshimura. A brilliant Works Finish from the headers to the tail pipe provides a look that is beautiful, yet durable. A custom carbon fiber heel guard finishes the look. If your familiar with the sound of the AT2 and the CP3 engine platform, you know the one of a kind exhaust note that emits from the faceted end cap is insane! Yoshimura also offers an AB Bracket kit option if you elect to remove the passenger pegs. Yoshimura's Speed Series AT2 is proudly designed, developed and manufactured in Chino, California. Fitment: 2025+ Yamaha R9 Specs: Proudly developed, designed and made in the USA. Yoshimura Part #: 13900SP520 Sound Insert / Spark Arrestor Options: # INS-35-K (Least quiet) ** # INS-20-K (Quieter) ** # INS-27-K (Quietest) ** ** Available direct through Yoshimura NOTE: When installing a full exhaust system, it is highly recommended to remap the ECU so that the bike runs properly, and also takes advantage of the new free-flowing exhaust. At this time, we do not offer ECU flashing, but you can search google for shops like vcyclenut, 2wheeldynoworks, and there are others that do this. SRMOTO PARTNER PRODUCT - Where To Buy: We don't currently carry this product for the Yamaha R9 , but we've partnered with a company that does. By clicking on the link below, you will be taken to one of our trusted partner websites. If you make a purchase from them, we do receive a small portion of the sale, at no extra cost to you. Yoshimura AT2 Full Exhaust for Yamaha R9 at Motosport Yoshimura Race AT2 Full Exhaust System - Yamaha R9 13900SP520 WARNING! - Motor sports can be extremely dangerous, injury or death can occur. No warranty is made or implied regarding any product sold by Devo Tech, Inc. / SoloRacer.com to protect users from injury or death. The user assumes all risks. Please read the rest of our Legal Disclaimer before ordering. Our on-line store is up and running 24 hours a day, 7 days a week. We use secure servers for all transactions so you can shop with complete confidence. If you are uncomfortable ordering online, call or email us for more ordering options. ©Copyright 2002-2026 by Devo Tech, Inc.