C 1323. Club Spec Miata (CSM). Showroom Spec Miata vehicles shall conform to
SCCA GCR Section 17. Automobiles and Section 17.1.3, Showroom Stock,
with the exception of the following restrictions or specifically the only
allowed modifications. These rules are not intended as guidelines or
suggestions and they will be vigorously enforced. All permitted components
/ modifications below shall not perform any additional function or purpose
other than the original part.
A. Make of Car
• 1990 - 1993 Miata 1600 cc @ 2300lbs (with driver)
• 1994 - 1997 Miata 1800 cc @ 2350 lbs. (with driver)
• Ballast must be mounted on the pan in the area normally
under the passenger seat and/or on the pan in the
passenger front footwell area.
• 1994 - 1995 1800 cc cars must use a 47 mm throttle
restrictor. Mazdaspeed, Part # 0000-06-9947.
• 1996 - 1997 1800 cc cars must use a 45 mm throttle
restrictor. Mazdaspeed, Part # 0000-06-9945.