Petaluma Speedway is proud to announce a partnership with Flowmaster Mufflers.  Founded in 1983 in Sonoma County Flowmaster is the industry leader in high performance racing mufflers.  Petaluma Speedway will host Flowmaster Nights on April 26th Civil War Night and June 28th USAC-CRA Night.  Petaluma Speedway’s Pit Stop USA Winged 360’s and Spec Sprint Series will adopt the Flowmaster 40 Series Delta Force Race Muffler for use.  The Pit Stop USA Winged 360’s will need to be in compliance by the April 26th Civil War Race which is sponsored by Flowmaster.  The Pit Stop USA Spec Sprints will have until their May 17th event to be in compliance.