Changing the air filter is very simple requiring no tools, just a simple rag and possibly some degreaser. Most people change it just before qualifying or if it is soaked in oil due to engine blow by
Rain forecast for the weekend with races on Saturday and Sunday. The SCCA Majors Western Conference at Thunderhill consisted of 13 Spec Racer Ford Gen 3s and 8 Spec Racer Fords.
