Making a 366 charger class vs a true-66 class is like calling it a cummins only race with latino drivers. What about all the other companies that make turbo-chargers? What about first budget upgrades on 6.0's and 6.6 trucks? Why can't they run their stock chargers that have been modified up to 66mm (IE Duramax Cheetah) or a drop in Garrett? Running a 66mm straight bore no clipped wheel bs, a true 66mm wheel MAKES it a restrictor race, along with weight limit, telling everyone who's already running a good setup then telling them they have to change type/frame charger to enter IMO means you're going to have a class of a few DD cummins trucks that show up since the S366 is only a budget drop in for them.
If we can run any frame we want as long as it's a 66mm wheel, I'll run this class at every event I go to (nearly all of them east coast..), all year long, however I'm not willing to stick an S300 in my truck for the race and switch it back to my (reliable) S400 framed charger to DD with. My truck is my DD, I run it like I race it, S300 limitation sucks.
If you guys REALLY want a S300 class, why not just have a drag racing work stock class with stock chargers... this class (I thought) was meant to be for us guys that are faster than the Index classes but not competitive in Pro-Street, hence the "Heavy-Street" name. This is for those guys that were begging for an 11.50 class.
7,000lb, true 66, no injectables, DOT tires FTW... you've covered the 99% of "hot rod diesels" on the road right there, it'll be fair, it'll be fun!