To all the teams going to run Clinton County Speedway. We’ll follow the Pass/Port Royal Speedway muffler rules. Having been informed that Port Royal Speedway is going to the Schoenfeld 14272735-78 for the 305’s next year. If you need to buy mufflers, we highly recommend 14272735-78. Most teams still have mufflers compliant to last years rule: These part numbers will be allowed this year, but teams should plan to move to the new number by the 2026 season PART NUMBERS STILL ALLOWED: 112530 112535 113035