Posted in World of Outlaws Sprint Cars

World of Outlaws Sprint Car Series – Muffler Update – Aug. 26, 2025

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New additions are Millstream and Lincoln Park Speedway. These two additions do not require mufflers.

 

2025 WoO SPRINT SERIES MUFFLER LIST (updated 8/26/25)
Volusia Speedway Park Barberville, FL Mufflers not required
Talladega Short Track Eastaboga, AL Mufflers not required
Magnolia Motor Speedway Colunbus, MS Mufflers not required
Kennedale Speedway Park Kennedale, TX Required: WoO Muffler Rule
Cotton Bowl Speedway Paige, TX Mufflers not required
Lawton Speedway Lawton, OK Required: WoO Muffler Rule
81 Speedway Park City, KS Mufflers not required
Arrowhead Speedway Colcord, OK Mufflers not required
Federated Auto Parts Raceway at I-55 Pevely, MO Mufflers not required
Knoxville Raceway Knoxville, IA Required: must use Schoenfeld 14272735-78
Jacksonville Speedway Jacksonville, IA Mufflers not required
Tri-State Speedway Haubstadt, IN Mufflers not required
Eldora Speedway Rossburg, OH Mufflers not required
Lincoln Speedway Abbottstown, PA Mufflers not required
Williams Grove Speedway Mechanicsburg, PA Mufflers not required
Ohsweken Speedway Ohsweken, ON Mufflers not required
Cornwall Motor Speedway Long Sault, ON Mufflers not required
Attica Raceway Park Attica, OH Required: must use Schoenfeld 14272735-78
Sharon Speedway Harford, OH Mufflers not required
Atomic Speedway Chillicothe, OH Mufflers not required
River Cities Speedway Grand Forks, ND Mufflers not required
Red River Valley Speedway West Fargo, ND Mufflers not required
Jackson Motorplex Jackson, MN Mufflers not required
Plymouth Dirt Track Plymouth, WI Required: WoO Muffler Rule
Beaver Dam Raceway Beaver Dam, WI Mufflers not required
Angell Park Speedway Sun Prairie, WI Required: WoO Muffler Rule
Knoxville Raceway Knoxville, IA Required: must use Schoenfeld 14272735-78
Huset’s Speedway Brandon, SD Mufflers not required
Cedar Lake Speedway New Richmond, WI Mufflers not required
Deer Creek Speedway Spring Valley,  MN Required: WoO Muffler Rule
Wilmot Raceway Wilmot, WI Mufflers not required
Attica Attica, OH Required: must use Schoenfeld 14272735-78
Eldora Speedway Rossburg, OH Mufflers not required
BAPS Motor Speedway York Haven, PA Mufflers not required
Williams Grove Speedway Mechanicsburg, PA Mufflers not required
Weedsport Speedway Weedsport, NY Mufflers not required
Federated Auto Parts Raceway at I-55 Pevely, MO Mufflers not required
Knoxville Raceway Knoxville, IA Required: must use Schoenfeld 14272735-78
Ogilvie Raceway Ogilvie, MN Mufflers not required
Jackson Motorplex Jackson, MN Mufflers not required
Mississippi Thunder Speedway Fountain City, WI Mufflers not required
River Cities Speedway Grand Forks, ND Mufflers not required
Red River Valley Speedway West Fargo, ND Mufflers not required
Huset’s Speedway Brandon, SD Mufflers not required
Vado Speedway Park Vado, NM Required: must use Schoenfeld 14272735-78
Bakersfield Speedway Bakersfield, CA Required:  DBA RULE  (Schoenfeld 14272735-78 is legal)
Perris Auto Speedway Perris, CA Required:  DBA RULE  (Schoenfeld 14272735-78 is legal)
Thunderbowl Raceway Tulare, CA Required:  DBA RULE  (Schoenfeld 14272735-78 is legal)
Millstream Speedway Findlay, OH Mufflers Not reuqired
Sharon Speedway Harford, OH Mufflers not required
Williams Grove Speedway Mechanicsburg, PA Mufflers not required
New Egypt Speedway New Egypt, NJ Mufflers not required
Lincoln Speedway Abbottstown, PA Mufflers not required
Lincoln Park Speedway Putnamville, IN Mufflers not required
LaSalle Speedway La Salle, IL Mufflers not required
TBD
The Dirt Track at Charlotte Concord, NC Mufflers not required