If you're doing 4 track days in the next 2 months....you're in for more
before the end of the year.....
Even if you ride street-track I would recommend a 520 conversion, less
weight and (relatively)cheap horsepower.
I have -1 +2 on my '05..that works pretty good on most tracks here in
SoCal (Buttonwillow,Fontana, Willow Springs, Streets of W, Pahrump).
Should be good also for Thunderhill.
Also like BD said, while stock chain is 110 links, cut yours @112 coz the
(41t.) sprocket, also gives you more wheelbase.
Chain: I like (DID)ERV 3.....sprockets: Driven or Afam.
Stay away from Vortex..