Yoshimura R77 Slip Ons

[Batfink]

This last bit of info has clinched it for me...

Here is my theory
You have just put on your new R77's and really, REALLY love the new sound of the bike, lets face it the stock cans make it sound like a sewing machine LOL
And to get the best sound out of them you are now riding the bike in the medium to high rev range (rather than the low to medium range you did with stock cans). This change in rev range will make the bike feel like it has less torque, run hotter AND use more fuel. These things I found out when I went for a Learner ride with a mate.... by taking it a lot easier and slower I saw/felt that my '13 busa
1. had a lot more available torque with every extra twist of the wrist
2. stayed cooler by the gauge
3. used a massive amount LESS fuel (a tank could do me 400+ klm compared to my ususal 250-300 klm )

You can get a little more out of your busa by getting it correctly mapped and dyno tuned but not sure if the expence is worth the results with such a minor change as slip-on R77's.

BTW.. Zooki does offer R77's as a Manufacturers option so I would think they require minimal, or no, adjustments