The most anticipated 450cc motocross bike for 2021 is here! With an all-new designed chassis and engine, the new Honda CRF450 is sure to set new records.

Our new RS-12 system for the new Honda CRF450 has been in development for over a year, no stone has been left unturned in our efforts to innovate and create the best exhaust system available. In collaboration with Honda Japan, HRC Honda and MXGP World Champion Tim Gajser, we were able to deliver!

The Yoshimura RS-12 and the 2021 Honda CRF450—made with one goal to provide the most precision tuned machine in motocross competition.

• Developed and tested in collaboration with HRC Honda Racing World Champion Tim Gajser and engineers the new RS-12 is ready for the race track and trails.
• Aggressive intelligently designed, the RS-12 asymmetrical shaped muffler allows maximize capacity and incorporates a resonance chamber for managing sound and increasing usable power. RS-12's unique profile also provides more clearance for tire and brake caliper.
• Unique oval manifold design was created using FEA process (Finite Element Analysis) and produced using state-of-the-art hydroforming process
• Improved performance gains, weight reduction and fit when compared to previous generation design
• Just like the works systems our Factory Racers use, RS-12 systems utilize precision machined joints. Machined joints provide a superior and exacting fit for joints by better securing the seal between two surfaces with a perfect 360 degree contact surface which translates into improved system life, fit and performance
• Works-look matte carbon fiber end cap with industry leading design and innovation end cap detailing as expected from Yoshimura
• Carbon end cap covers inner cap mounted design improves durability, and eases servicing as compared to other sandwich mounting designs most commonly found in the industry
• New patent pending Precision Taper Fit (PTF) insert ring makes it easy to install and remove sound inserts and spark arresters
• Tapered muffler body inlet design of RS-12 enables the system to be pushed forward thus helping with weight centralization without sacrificing performance
• Repack Kits, optional Inserts and Spark Arresters are available for all models

UK Delivery Charges

Free delivery on all orders £100 and over*

All orders over £100 are delivered FREE*. All orders from the Mega Motorcycle Store are dispatched using secure couriers, which are fully insured and trackable. All customers receive an online tracking number when their order is dispatched, enabling them to track the location of their delivery online.

*Free Delivery over £100 includes mainland UK only. Excludes Northern Ireland.

UK Delivery Charges

• Orders under £100: £4.99
• 24-hour delivery: £5.99
• Saturday delivery: £14.99
• Orders over £100: FREE 48-hour delivery
• Refund charge: £2.99

Our UK delivery charges apply to remote areas such as Shetland and the Highlands. For all other destinations, please add your items to the shopping cart on the website and calculate the delivery costs to your destination.

UK Delivery Times

Orders must be placed before 1pm for same-day dispatch.

Please allow 1-2 working days for delivery within the UK.

For deliveries outside the UK, please allow 5-7 working days.

Next working day delivery cut-off time is 13:00.

Orders placed on a Bank Holiday will be dispatched on the following working day. Deliveries to Ireland and Scotland may take an extra day depending on your location.

Orders placed on a Saturday or Sunday will be dispatched on the Monday. If you have paid for Next Working Day delivery, your delivery will be due on the Tuesday.

European Delivery Since 1 July 2021, most goods to the EU (including gifts) are now subject to VAT and potentially a clearance fee. The taxes and duties applied depend on the individual contents of the parcel, the weight, and the value. We cannot estimate the costs that may occur and we are not responsible for any fees you may need to pay.

To get a shipping quote for your country, please follow the checkout process and input your delivery address.

Terms and Conditions:

Express delivery applies to mainland UK only and cannot be guaranteed for the Scottish Highlands and other isolated areas. Please contact us if you need further details.