Please see below for the most recent updates for both Club Spec Mustang (CSM) and Club Spec MX-5 (CSX) (changes indicated in red). All changes have also been incorporated into the rulesets online here.

Club Spec Mustang (CSM)

Vehicle Requirements

For Manual Transmission: Rear Axle Assembly Gear Ratio: 3.55:1
For Automatic Transmission: Rear Axle Assembly Gear Ratio: 3.31:1

Required Performance Kit

C. Tires: Goodyear F1 Supercar 3 (220 Treadwear), size 275/40R18

• Note: For Time Trials events in wet conditions, any tire with a treadwear rating of 300 or higher and a section width of no more than 275 may be utilized.

E. Suspension

1. Sealed KONI Sport Strut, Front, Part# TBA 8741-1494SPORT*
2. Sealed KONI Sport Strut, Rear, Part# TBA 8241-1240SPORT*
   • *For competition programs, struts must be sealed by an authorized KONI dealer.
3. Eibach Pro-Kit Lowering Springs- Part# 35101.140
4. Choice of:
   1. Strano Performance Parts kit Part# SpecS197-1. Includes bars, bushings, collar locks, Billet aluminum rear mounts
   2. Strano Performance Parts kit Part# SpecS197-2. Same as above, adding front sway bar mount reinforcements + Billet Front sway bar brackets
   3. Eibach Mustang Anti-Roll Bar Kit- Part# 35101.320
5. Choice of:
   1. Maximum Motorsports Caster Camber Plates- Part# MM5CC-1
   2. BBK Performance Caster Camber Plates- Part# 2551

Authorized Changes/Modifications

Safety

1. SCCA Safety Levels 2 and 3 are allowed
2. Provided the vehicle fully meets SCCA Safety Level 2 as defined in the Time Trials Rules, the following may be added, replaced, or modified within the guidelines stated in Safety Level 2:
   1. Compliant Rollbar (Required for Safety Level 2)
   2. Fixed back racing seats for driver and passenger side
   3. Racing harness(es)
   4. Replacement of steering wheel and/or removal of steering wheel airbad
   5. Rear seats carpet and trim behind the seats may be removed
   6. Sunroofs, moonroofs, and similar roof-mounted panel cartridges may be replaced by an alternate solid panel serving no other purpose. Attachment is unrestricted but must be secure.
   7. Airbags may be removed
3. Vehicles that do not meet SCCA Level 2 Safety may not substitute or modify seats or steering wheel, however driver restraints as outlined in Solo® Rules section 3.3.1, Driver Restraints, are allowed. Seats may not be cut to allow for the installation of alternate seat belts or harnesses. A horizontal “harness bar” may be used as part of the installation hardware for allowed driver restraints provided it has no more than two (2) attachment points to the chassis and is bolted at those locations. A C-type harness bar may also be used; it may have four (4) bolted attachment points to the chassis (2 primary and 2 supporting connections to resist rotation). Truss-type harness bars with more than two (2) attachment points are not allowed.
4. If the vehicle is equipped with a minimum 6-point roll cage, driver's seat, and restraints meeting SCCA Time Trials Safety Level 3 Standards, all interior carpet, trim, and passenger seats, other than the factory dash, may be removed.

Suspension

C. Ford Racing Rear Control Arm may be utilized, Part# 9R3Z5A649B
D. The following Front Control Arms may be utilized:

1. Ford Part# 4R3Z3078B
2. Ford Part# 3079B
3. Ford Racing Part# M-3075-E
4. Motorcraft Part# MCF 2364 and 2365

E. Ford Performance Bump Stop Kit may be utilized, Part# M-5570-A

Engine and Drivetrain

G. Exhaust piping downstream of the catalytic converter may be substituted before and/or after the mufflers including exhaust tips.

Club Spec MX-5 (CSX)

Required Performance Kit

B. Tires: Falken Axenis RT660, size: 225/45R17

• Note: For Time Trials events in wet conditions, any tire with a treadwear rating of 300 or higher and a section width of no more than 225 may be utilized.

Authorized Changes/Modifications

Safety

A. SCCA Safety Levels 2 and 3 are allowed.

E. If the vehicle is equipped with a minimum 6-point roll cage, driver's seat, and restraints meeting SCCA Time Trials Safety Level 3 Standards, all interior carpet, trim, and passenger seats, other than the factory dash, may be removed.