UK customers - please note this silencer is not road legal in the UK and will be marked Not for Road Use Full Exhaust System Fits: Yamaha YZF1000R Thunderace 1996-2003 models. - Weight : 3.8 Kilos (8.4 lbs), Saving over 7 kilos ( 15 lbs ) on the original headers. - These upgraded headers are designed to out perform the original headers with no EXUP valve. - No re-jetting/modifications required for bikes on standard settings. - Four engine port gaskets included. We also include the slip on silencer flange which allows you to refit the original Yamaha silencer if you wish to. - Remove the exhaust control cables, leave the electric motor in place. No fault codes will show. - Silencer is fitted with a removable baffle, instructions are included.