better cooling would save motors in RM. On a hot day at pueblo we have 30% less scrub air, dense traffic, and 110-130deg boundry layer air temps. Still a product availability/price problem in this area but an expensive radiator is still cheaper than a motor

My Take

4) Good.. may need to change wording. The intent is allow modding the lower cross support only. This should allow all cars (not just late) to fit a turbo radiator. I don't see how installing a larger radiator will change the performance balance. It can save some motors. I do admit care must be take to ensure this wording does not allow unintend consequences that violate the intent, but met the letter of the rule.

5)Yes on cooling fans. Lets let the racers chose what they want. Frankly if we allow different size radiators we need to allow fans/shrouds to match.

Doesn't someone make a thicker (more rows) radiator that fits in the stock location?