Yoshimura RS-9T Exhaust Review on the 2019 Honda CRF450R

The 2017-2019 CRF450R's new engine and muffler configuration gave us the opportunity to create an entirely new system built specifically for the new CRF450 machines. Introducing our all-new Signature Series RS-9T tapered dual muffler exhaust system for the all-new CRF450R.

Yoshimura has been working tirelessly on development with American Honda HRC's engineers to achieve maximum performance and mass centralization, to optimize rider usability. Yoshimura achieved all this by moving the new RS-9T mufflers forward in order to tuck in under the side number plates. Working with HRC race engineers and the all-new 449cc Unicam engine and its unique downdraft fuel injection system, Yoshimura was able to deliver an exhaust that provides more tractable power and improved torque.

Some features on the new RS-9T dual tapered muffler CRF450R/RX system include:

Dyno and track tested by Honda R&D in Japan, American Honda MX Team, and HRC All Japan MX Racing Team

ALL-new 3-stage header provides broader overall range of power and throttle response

New tail pipe divider creates smoother exhaust flow and better velocity to the right and left tail pipe

New compact forward positioned RS-9T dual muffler design provides lower center of gravity for better mass centralization

Larger RS-9T core creates improved throttle response, and power in mid and top end

New RS-9T mufflers have more volume than stock to provide a decrease in overall dB noise level

Works with or without Honda's new optional electric start system

Stainless Steel Header and Tail-pipe

[METALMULISHAWOLF]

Might be a dumb question but Ahh just bought one of these bad boys and do a lot of farm riding, in love with the bike but just first is so snappy like when you’re just trying to get up to a gate to unlatch it just wondering if there’s away to get around it ?

[codprocamp]

Do you have to Power Commander it after?

[WillonWheel]

I just bought a full system from you guys for my 2020 crf450r do I have to reflash my ECU??

[brodyrichard]

I'm having trouble with the right side header wiggling on mine ...did you guys not send me gaskets? Does it even get gaskets on the header to the head motor ..why is this wiggling but the left side dont

[kendrickdawson]

So is it a 450cc??? Or 250cc???
I don't thank I can handle a 450 jus yet

[enricopucci]

*NICE SOUND BUT IS A LAME THEY TAKE AWAY RHE KICK STARTER*