Thanks Gary for responding! That explains some but not everything. It’s sad that you spend 10k on brand new equipment and can only race on one national series with out having to buy a different engine to compete in another one. I think the ROK cup understands the customers with there affordable engine rentals. As for fair, just about every auto racing series have multiple engines and car manufactures. And all the racing seems equal except for Formula 1, which is suppose to be a spec series. If weights are not enough add restrictors, there suppose to be Pro series. For example, they told Cadillac to dial back their engines for being to fast in the Prototype class.