Did you happen to see what cat they installed? I need to get one fitted but buggered if I'm letting them do that to my pipe and charge that much for the pleasure!
As mentioned in my post above one way is to fit a later FZ6 link pipe, it requires some fabrication but that is fairly straightforward for any skilled fabricator.
https://www.sparesunlimited.co.uk/yamaha-fz6-fz6n-2004-2006-fz6s-2004-2005/Or you can go the same route as Riverbank they will fit something very similar if not the very same as, they come in various sizes to suit your pipe diameter. I've not used these, but know of people who have. In a lot of EU countries bikes are tested for emissions and have been for years, many owners are forced to retro fit as it was country wide not just a specific city or town etc.
https://www.louis-moto.co.uk/artikel/retrofit-catalytic-converter-for-sbk-exhaust-systems/10027049Unlike the UK where the market has concentrated on decat, link pipes etc. This will change and at speed, as mentioned all new bikes within a few years at
most, will be emission tested like cars and I think it's very possible in time any vehicle under going the standard MOT will to.
At present any vehicle over 40yrs old is exempt from MOT and VED, because they're deemed not to be variable for daily use, commuting etc. Yes a few might still be used to commuting but the vast majority will be weekend, high days and holiday use only.