1.8 liter displacement cars may not run an aftermarket air intake and NB models must run a throttle restrictor, while the 1.6 liter displacement cars do not require a restrictor, they may run a modified air box, and may remove the driver corner light. The class calls for "stock" engines with some modifications allowed in the name of balancing factory tolerances. Engine builders have been taking advantage of this for years, and "Top Prep" engines make 10-20 horsepower more than a healthy stock engine and cost several thousand dollars. The full rules for the class may be found in the current Spec Miata Category Specifications of the SCCA rule book, called the GCR (General Competition Rules & Specifications). SCCA national champions 2022 Nick Bruni, Arlington, VA 2021 Preston Pardus, New Smyrna Beach, Florida 2020 Preston Pardus, New Smyrna Beach, Florida 2019 Todd Buras, Melbourne, Florida 2018 Mark Drennan, San Jose, California 2017 Preston Pardus, New Smyrna Beach, Florida 2016 Justin Hille, Ypsilanti, Michigan 2015 Johnathan Goring, Norfolk, Connecticut 2014 Erik Stearns, Van Buren, Ohio 2013 Jim Drago, Memphis, Tennessee 2012 Jim Drago, Memphis, Tennessee 2011 Elivan Goulart, Shelton, Connecticut 2010 Andrew Charbonneau, Delray Beach, Florida 2009 Steven Gorriaran, Providence, Rhode Island 2008 Eric Foss, Northeast Oklahoma Region 2007 Brad Rampelberg, San Francisco Region 2006 Andrew Caddell, Northwest Region NASA national champions 2022 Aaron Jeansonne 2021 Preston Pardus 2020 Race was not held. 2019 Jim Drago 2018 Danny Steyn 2017 Michael Ross (East) 2017 Tristan Littlehale (West) 2016 Tyler Kicera (East) 2016 Nick Sommers (West) 2015 Mark Drennan (East) 2015 Mark Drennan (West) 2014 Alex Bolanos 2013 Matt Schultz 2012 Yiannis Tsiounis 2011 Nathanial Sparks 2010 Dan Mackeever 2009 Andy Rushing 2008 Todd Lamb 2007 Todd Lamb 2006 Greg Stasiowski References The current NASA SM Rules are downloadable at . The current NASA SSM Rules are downloadable at . General Competition Rules and Specifications, 2006, Sports Car Club of America. The current edition of this book is downloadable from the SCCA website at this page. Contact MazdaSpeed for parts and support at this page . External links Sports Car Club of America Spec Miata Challenge from the National Auto Sport Association Mazda Racers - Official Spec Miata and Mazda racing community Spec RX-7 - Spec Miata alternative Mazda MX-5 One-make series Racing cars Sports Car Club of America