Finally something I can actually speak to...
Qualifications:
1) 2005 Hayabusa (mostly stock)
2) 2003 Porsche Boxster S
3) 2005 Corvette
4) 2007 Mustang GT (wife's car)
5) Driven just about every road course in the US at speed in everything from rental caprices to lamborghini murcielagos
6) My bike and I are one when we're together and we like twisties
The eternal question of who would win comes down to the variables in either side of the equation.
Let's go with what we know
Location: Silverado Trail in Napa (
Silverado Trail - Wikipedia, the free encyclopedia)
Conditions: Friday morning, no traffic
Weather: Sunny, 80F
Hayabusa vs. Boxster S
Hayabusa wins. This road rewards quick acceleration and deceleration. You don't meander through this route, you gun it, brake it, turn it, gun it, do it all again and again. The Porsche is a momentum machine. It doesn't accelerate like a busa and does better in long sweepers where you don't need to shut it down to 10mph to make the turn.
Hayabusa vs. Corvette
Corvette wins. Same reasons the Busa won above only the corvette brakes harder than the busa and lets the rear slip away slightly when the computer is in "competitive driving mode" letting the driver take the turns a little faster.
Hayabusa vs. Mustang GT
The fat pig of a mustang can barely turn out of the driveway much less on a twisty road. It loses on so many levels. (Wife loves it, I can't stand it)
And to be honest, if it's raining. Car wins everytime. And if I'm carrying groceries home, car wins again.
And my final point, price. The Busa costs less than any halfway-decent real sports car (your turbo VW bug is not a sports car). That alone is worth a win IMO.