My first bike was a DT125 twin shock! then had the 175 when I turned 17, they are in my blood!
The pipes on the B-King were Laser Exhausts, looked great but were a little quiet even with the baffle plates removed.
Only mods I did were cosmetic, all the carbon fibre bits were after I binned it, cheaper to go carbon than pay suyzuki prices, the tank pods were £700 each from suzuki or two for £350 from Powerbronze.
Mate of mine dumped the SET valve, used a bypass pipe and got rid of the cat too, didnt make a huge difference but worth doing. The B-King has a much softer tune than the Hayabusa for some reason but is still lightning fast!! Fastest I have ever been on a bike was on the M6 between Carlisle and Penrith, no bridges, no junctions and nowhere for the police to hide
I do miss my B-King but it made me ride like a hooligan!! I know!! It's me not the bike, but.....