I hope all these rules don't obsolete every "National" engine...running them restricted has worked pretty well for the IRS for years...many "2.4s" & 1000s ran top 3 / top 5 (at least one win too...) with BMARA in 2015. I DO hope that ALL the clubs (including IRS & BMARA) get on a harder 10" RR RACE tire in 2016...& do like KNOXVILLE 410 SPRINT CARS, AND OTHER OPEN WHEEL CLASSES (not to mention many of the PAVEMENT stockcar tracks in the IL/WI area) have rules & limits on the amount of new rubber you can throw at your car every race or so...