LMAO! I think that would be an ace idea!!
In the interests of transparency I should probably point out i'm a 'regular plod' as you put it, (e.g. Response as opposed to Trafpol) and you're quite right about what will be checked on a stop. I'd most likely compliment you on the sound of the Duc, but if you tried telling me the sticker was genuine you'd be told not to take the piss
LOL
For what it's worth, my '03 R1 that, until Saturday, I owned for 5 years came with a full Akra carbon/Ti system which also had a dodgy E mark sticker on it - I was only ever pulled over on it once (by Traffic - for exuberant filtering
) and it wasn't even mentioned. Had it have been, I wouldn't have tried pulling the wool over his eyes as it's unlikely to be convincing LOL. Before the R1 I had a TL1000R with twin race pipes - I imagine your Duc sounds similar to that e.g. bloody loud and spits flames? ;D
The way i've always looked at it, unless you're bouncing off the limiter past people's houses at 3am, then you're doing no harm, and loud pipes save lives. All IMHO, not necessarily the opinion of my employers etc etc etc.
Dave