By the way the (P) spec rating made specifically for the Busa adds and extra layer of carcase in the tire for high speed and heat stability due to what this thing can do to tires. This tells you something that the engineers must know or be worried about. I run the M1 Sportec 190(P) on the rear and love it!
The Sportec (P) actually measures out to the same 198 that the factory 190 does!