Just received my Bcs backbox yesterday...what can I say,the quality of the weld and work is amazing...it's 3" all the way,it makes the milltek looks like chopstick pipes hahaha..Can't wait to go & get it fitted on the 7th aug at BCS haydock...(it be a 200mile drive up to haydock but it be worth it)..Dave & nige are top blokes even if I Havant met them yet, they will bend over backwards to your requirements,eg there agreed to help me fit the system at 7am that day as I have a very tight schedule...don't ask for pics as I'm s##t with computers.. Can't wait...