Posted this on the other forum and forgot I hadn't put it here too (really need a post to both button...) Thought it may be of use in light of the other cobra thread. I got hold of a db meter to have a go at measuring how loud the cobra non res is after we used a fairly basic meter to measure a few at the last midlands meet. I positioned the meter on a tripod equidistant between the two tailpipes and level with them. These were the approximate readings I got:- Cold start up peak - 111db This fairly quickly settled to 99db Then settled again to 89db Eventually sat at 77db I'll get some static readings at 6k rpm when I can (couldn't do this to my neighbours on the drive way!) I'll also try and get some drive by figures (anyone know what sort of revs the car would generally be at when passing trackside meters?) Also arranging to meet up with Pitman and get some readings of his new set up and hopefully a few others. Will update this thread with new data as and when I get it.