Diameter of 1299 system is 60mm, confirmed. Prices may adjust slightly but will remain largely consistent.
Worth noting that the high price is not Ducati adding extra margin and "fleecing" customers, the Akra stuff has eye-wateringly high costs to us too. It's the best production titanium exhaust in the world, simple as that.
On the bright side this bike, bone stock, has a free flowing exhaust, is far lighter than any competitor, and is a beast. The Akra stuff is for those who want to save even more weight, but by no stretch of the imagination is it "needed". Case in point - our tester Ale's time at Mugello in 2014 on a stock 1299s with non-slick street tires (SC2), was only four seconds slower than Nicky Hayden's best testing time a year earlier on Checa's WSBK with full slicks.
Let's put that in perspective. The difference between:
our tester
treaded street tires
production 1299s, bone stock
and
former world-champion, still-active GP rider, pushing the limit in testing
full racing slicks
full WSBK
was 4 seconds
on one of the fastest tracks in the world. I'm sure some of you know that tires alone can make that kind of difference on a track like Mugello.
The only faster production bikes are the SL and Pani R. And yes, we test all the competition.