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Provisional Car Classifications--updated 3-16-23

Greg G.

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Here are the ST Cars approved and added to the list in Appendix C since the most recent ST 5/6 Rules release 12-1-22 (v6.1):

Appendix C—Additional ST6 Eligible Vehicle Models
The following vehicles are approved to compete in ST6 despite either an OEM HP or engine displacement greater than the listed maximum in Section 4. For the vehicles with engine displacement greater than 2449cc, no modifications to increase displacement are permitted. A 10cc variance from the factory displacement listing shall be permitted, but any vehicle inspected with greater than 10cc over the listed displacement below, shall be disqualified. Engines from these vehicles may only be used as a swap donor to ST6 eligible vehicles of the same model of a different year.



Here are the ST Cars approved and added to the list in Appendix B since the most recent ST Rules release 12-1-22 (v17.1):

Appendix B— ST3 & ST4 BTM Aero Modification Factor non-BTM approvals
The following vehicle higher level trim models are approved for the BTM Aero Modification Factor in section 6.3 (note: any rear wing or spoiler or rear diffuser must be removed):

BMW M235i (2014-2016) (3-16-23)


Here are the ST cars approved for "Production" vehicle status since the most recent (ST) Rules release 12-1-22 (v17.1):

6.5.3 Non-Production Vehicles Approved for “Production” Vehicle Status
The following vehicles are approved to use “Production” vehicle status, provided that the frame/chassis, body/aero remain in the original manufactured configuration as specified by the manufacturer (unless designated otherwise below). The “Chassis” Modification Factors and the “Production Vehicle Body” Modification Factors shall not be assessed, but the vehicle specific Modification Factor listed below for each model will apply in addition to other Modification Factors (power, tires, transmission, and drivetrain). None of these vehicles are
eligible for the “BTM Aero” Modification Factor. Only the vehicles designated “ST4 approved” may participate in ST4.



Edited by Greg G.
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  • Greg G. changed the title to Provisional Car Classifications--updated 3-16-23
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