UK customers - please note this silencer is not road legal in the UK and will be marked Not for Road Use Low Level Exhaust System Fits: Yamaha YZF R7 2021-2024 models Made from 304 grade stainless steel for maximum strength and durability. Exhaust emissions are not part of the UK motorcycle MOT, this exhaust system will pass a UK MOT. Accepts your original lambda (O2) sensor keeping your bikes engine management system, so no changes or modifications are required to your bike. No fault codes will appear when you install our system. Weighs in at a lightweight 4.03kg compared to the original system at 7.15kg Silencer is fitted with a removable baffle, instructions are included. Pipework Material: 304 Grade Stainless Steel. Silencer Material: 304 Grade Stainless Steel Silencer.