{"id":225,"date":"2025-01-25T14:17:15","date_gmt":"2025-01-25T19:17:15","guid":{"rendered":"http:\/\/dirtcar-rules.local\/?page_id=225"},"modified":"2026-01-25T14:13:28","modified_gmt":"2026-01-25T19:13:28","slug":"world-of-outlaws-sprint-car-series-muffler-rules","status":"publish","type":"page","link":"https:\/\/dirtcar.com\/rules\/series-rules\/world-of-outlaws-sprint-car-series\/world-of-outlaws-sprint-car-series-muffler-rules\/","title":{"rendered":"World of Outlaws Sprint Car Series Muffler Rules"},"content":{"rendered":"\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 2026 WoO SPRINT SERIES MUFFLER LIST\u00a0<\/strong><\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
Volusia Speedway Park<\/td>\nBarberville, FL<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Talladega Short Track<\/td>\nEastaboga, AL<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Magnolia Motor Speedway<\/td>\nColumbus, MS<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Kennedale Speedway Park<\/td>\nKennedale, TX<\/td>\nRequired: WoO Muffler Rule<\/td>\n<\/tr>\n
Lawton Speedway<\/td>\nLawton, OK<\/td>\nRequired: WoO Muffler Rule<\/td>\n<\/tr>\n
Creek County Speedway<\/td>\nSapulpa, OK<\/td>\nMufflers not required<\/td>\n<\/tr>\n
US 36 Raceway<\/td>\nOsborn, MO<\/td>\nMufflers not required<\/td>\n<\/tr>\n
81 Speedway<\/td>\nPark City, KS<\/td>\nMufflers not required<\/td>\n<\/tr>\n
I-55 Federated Auto Parts Raceway Park<\/td>\nPevely, MO<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Jacksonville Speedway<\/td>\nJacksonville, IA<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Tri-State Speedway<\/td>\nHaubstadt, IN<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Knoxville Raceway<\/td>\nKnoxville, IA<\/td>\nRequired: must use Schoenfeld 14272735-78<\/td>\n<\/tr>\n
Attica Raceway Park<\/td>\nAttica, OH<\/td>\nRequired: must use Schoenfeld 14272735-78<\/td>\n<\/tr>\n
Sharon Speedway<\/td>\nHartford, OH<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Lincoln Speedway<\/td>\nAbbottstown, PA<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Williams Grove Speedway<\/td>\nMechanicsburg, PA<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Eldora Speedway<\/td>\nRossburg, OH<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Knoxville Raceway<\/td>\nKnoxville, IA<\/td>\nRequired: must use Schoenfeld 14272735-78<\/td>\n<\/tr>\n
Huset’s Speedway<\/td>\nBrandon, SD<\/td>\nMufflers not required<\/td>\n<\/tr>\n
River Cities Speedway<\/td>\nGrand Forks, ND<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Nodak Speedway<\/td>\nMinot, ND<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Hartford Speedway<\/td>\nHartford, MI<\/td>\nRequired: WoO Muffler Rule<\/td>\n<\/tr>\n
Plymouth Dirt Track<\/td>\nPlymouth, WI<\/td>\nRequired: WoO Muffler Rule<\/td>\n<\/tr>\n
Angell Park Speedway<\/td>\nSun Prairie, WI<\/td>\nRequired: WoO Muffler Rule<\/td>\n<\/tr>\n
Knoxville Raceway<\/td>\nKnoxville, IA<\/td>\nRequired: must use Schoenfeld 14272735-78<\/td>\n<\/tr>\n
Huset’s Speedway<\/td>\nBrandon, SD<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Cedar Lake Speedway<\/td>\nNew Richmond, WI<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Wilmot Raceway<\/td>\nWilmot, WI<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Attica Raceway Park<\/td>\nAttica, OH<\/td>\nRequired: must use Schoenfeld 14272735-78<\/td>\n<\/tr>\n
Eldora Speedway<\/td>\nRossburg, OH<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Ohsweken Speedway<\/td>\nOhsweken, ON<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Weedsport Speedway<\/td>\nWeedsport, NY<\/td>\nMufflers not required<\/td>\n<\/tr>\n
BAPS Motor Speedway<\/td>\nYork Haven, PA<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Williams Grove Speedway<\/td>\nMechanicsburg, PA<\/td>\nMufflers not required<\/td>\n<\/tr>\n
I-55 Federated Auto Parts Raceway Park<\/td>\nPevely, MO<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Knoxville Raceway<\/td>\nKnoxville, IA<\/td>\nRequired: must use Schoenfeld 14272735-78<\/td>\n<\/tr>\n
Ogilvie Raceway<\/td>\nOgilvie, MN<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Jackson Motorplex<\/td>\nJackson, MN<\/td>\nMufflers not required<\/td>\n<\/tr>\n
River Cities Speedway<\/td>\nGrand Forks, ND<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Red River Valley Speedway<\/td>\nWest Fargo, ND<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Huset’s Speedway<\/td>\nBrandon, SD<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Belleville High Banks<\/td>\nBelleville, KS<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Dodge City Raceway Park<\/td>\nDodge City, KS<\/td>\nMufflers not required<\/td>\n<\/tr>\n
El Paso County Raceway<\/td>\nCalhan, CO<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Stockton Dirt Track<\/td>\nStockton, CA<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Bakersfield Speedway<\/td>\nBakersfield, CA<\/td>\nRequired:\u00a0 DBA RULE\u00a0 (Schoenfeld 14272735-78 is legal)<\/td>\n<\/tr>\n
Ventura Raceway<\/td>\nVentura, CA<\/td>\nRequired:\u00a0 DBA RULE\u00a0 (Schoenfeld 14272735-78 is legal)<\/td>\n<\/tr>\n
Williams Grove Speedway<\/td>\nMechanicsburg, PA<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Millstream Speedway<\/td>\nFindlay, OH<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Mansfield Speedway<\/td>\nMansfield, OH<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Sharon Speedway<\/td>\nHartford, OH<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Lincoln Park Speedway<\/td>\nPutnamville, IN<\/td>\nMufflers not required<\/td>\n<\/tr>\n
Texarkana 67 Speedway<\/td>\nTexarkana, AR<\/td>\nMufflers not required<\/td>\n<\/tr>\n
The Dirt Track at Charlotte<\/td>\nConcord, NC<\/td>\nMufflers not required<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0…<\/p>\n","protected":false},"author":218,"featured_media":0,"parent":11,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"template-full-width-page.php","meta":{"footnotes":""},"class_list":["post-225","page","type-page","status-publish","hentry"],"yoast_head":"\nWorld of Outlaws Sprint Car Series Muffler Rules - DIRTcar Rules<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dirtcar.com\/rules\/series-rules\/world-of-outlaws-sprint-car-series\/world-of-outlaws-sprint-car-series-muffler-rules\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"World of Outlaws Sprint Car Series Muffler Rules\" \/>\n<meta property=\"og:description\" content=\"\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/dirtcar.com\/rules\/series-rules\/world-of-outlaws-sprint-car-series\/world-of-outlaws-sprint-car-series-muffler-rules\/\" \/>\n<meta property=\"og:site_name\" content=\"DIRTcar Rules\" \/>\n<meta property=\"article:modified_time\" content=\"2026-01-25T19:13:28+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/dirtcar.com\\\/rules\\\/series-rules\\\/world-of-outlaws-sprint-car-series\\\/world-of-outlaws-sprint-car-series-muffler-rules\\\/\",\"url\":\"https:\\\/\\\/dirtcar.com\\\/rules\\\/series-rules\\\/world-of-outlaws-sprint-car-series\\\/world-of-outlaws-sprint-car-series-muffler-rules\\\/\",\"name\":\"World of Outlaws Sprint Car Series Muffler Rules - 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