What if I just had a carb balance and clean less than 400 miles ago?
Just the fact that they've been balanced at all is a huge plus, and a lot of the exhaust manufacturers will say it won't need to be done, just bolt it on and off you go.
And as you already have an after market can fitted, the chances are it'll be fine.
I'm a fan of the noisier exhaust too, but i found that eventually there were things to consider.
Motorway journeys can become a bit of a headache with a loud exhaust, and can sound a bit monotonous as well very quickly, so bear that in mind.
And although i like the fact other motorists can hear you approaching before they can see you, this also applies to the police, so it can give you very unwanted attention as well. Although as said, that Moto GP can has the correct stamp on it and as long as it is baffled it is borderline legal with the baffle in, and will pass an MOT as long as you mention these things to the examiner beforehand.
I tried it one day without the baffle in and i could see heads turning 100 metres ahead of me, which i wasn't keen on at all, even if the bike did sound awesome.