@glengrahame update: did a track day at Brands yesterday and failed the noise test with these dB killers..measured at 103db when limit was 102db. Had to put the pukka Termi ones in and it passed.
Thanks for the update, I'm looking at going to Snetterton on the 4th evening session with the termi ones in so fingers crossed. Is yours the full Termi exhaust? And the 848?