track day cans

[c8p]

Just found out that the 100db limit at castle combe is tested at 4500rpm, this means my Griff is likely to be too loud (it measured 100db @ 4000rpm). Does anyone local have trackday silencers for a Griff that I could borrow/rent in case I fall foul of the regs? If not are ACT the only people to get them from?
Also looking forwaard to meeting a few of you on the 20th... just going to sign up now.