Tony,
Besides, why even bother because the stock ISR PRO classes are just about who is the better cheater. reality is there is NO such thing as a "Stock" class anymore, it's above us average racers. Your kidding yourself if you think that you can take a box-stock / out of the crate sled and you have the same sled as what the factory guys have and can be competitive.
You think Guy Breton is running a production "stock" pipe? PPffss... and what did he get caught for?
Do you think the bearings in their idler wheels are the same as what comes out of the factory? Pffssss...
Do you think their ECU's and CDI boxes are straight off the production line? Ppffsss...
Stick with the mod classes where it's not so easy to dominate by cheating, it's already been proven the SRX can run with the best of them including the lighter twins. Watch what they do in Pro Stock this year, if the results from the last two years at HayDays and Epping are any indication...