If that design saved you 10db I'm well impressed ... have used similar ones over the years to tame my 14k rpm single seater as noise regs crept into more tracks, and found 3db closer .... but could be that they suit your specific car just nicely... however, I've also found track sound tests (even the MSUK ones administered by their trained scrutineers) to be a bit 'wobbly' at times 🙂
Where did you get them? ... looking for a couple for my wife's 500cc scrambler (currently on open pipes) ... they look like they'd tame the exhaust 'crack' a treat if they do them in smaller sizes 👍
