I am currently partway through making a decat pipe for a mates CB1000R. At the very least it gets rid of about 4kg of metal and catalytic converter. It occured to me that CBR1000RRs have a cat as well. If anyone is interested and has a nice silencer in mind , I can make the connections to your headers or 4 into 2s and provide a Lambda sensor connection and outlet pipe to suit your silencer. Can anybody supply photos of their exhausts and take precise measurements of the O/D of their headers/4 into 2s . If anybody fancies a ride down my way, I can provide a few brews, breakfast/lunch and some fantastic roads in my area in exchange for some measuring time. I am not a business, yet! Just seeing what demand is like and setting up for some pocket money jobs when I take early retirement, hopefully next year !!!