1. Tuner Category - Interior

You can add or take away anything allowed in Sport Category. This means you can add cosmetic items that don’t make the car any lighter and have little to no effect on performance, and you can replace the driver and passenger seats with full size/upholstered seats.

In addition, you can change any steering wheel (as long as it stays close in size) and drill holes for your remote-reservoir shocks.

Also here - you are not limited to Sport Category short-shift kit rules, you may now change the entire linkage.

As with Sport Category, you can still take advantage of the “safety loophole.” If you add a roll bar meeting Safety Level 2 Standards, you can remove carpet and trim (convertible tops included) from behind the driver and passenger seats and even replace an airbag-equipped steering wheel. If you install a full cage meeting Safety Level 3 Standards, you can remove all the trim and carpet other than the dash.

Tuner Category Interior - Full Rules

1. A hole may be added through the bodywork to route a remote reservoir for shocks/struts and hose to a remote mounting location. Such holes may serve no other purpose.

2. Any steering wheel may be used. An alternate steering wheel assembly—including all mounting hardware—which replaces an airbag-equipped wheel is not required to have an airbag. An alternate wheel is not required to have a horn button.

3. Any shift linkage may be used.

Sport Category Interior - Full Rules

1. Accessories, gauges, indicators, lights and other appearance, comfort and convenience modifications including pedal cover kits, alternate shift knobs and paddles which have little or no effect on performance and/or handling and do not materially reduce the weight of the car are permitted. Delayed shutdown devices such as a “turbo timer,” which perform no function while the car is in motion, are permitted. This does permit the installation of an additional mirror (e.g., Wink®). The addition of small holes for attachment hardware for cosmetic modifications is implicit (e.g., holes for fasteners to mount additional gauges).

2. The driver and front passenger seats may be replaced with the following restrictions.

A. The seating surface must be fully upholstered.

B. The top of the seat, or an attached headrest, may not be below the center of the driver’s head.

C. The seat shall be securely mounted, so as to provide fore/aft and lateral support.

D. Passenger seat must be either OE or match the requirements for the driver’s seat.

3. Alternate steering wheels are allowed, provided the outside diameter is not changed by more than 1-inch from the standard size. Steering wheels with an integral airbag may not be changed unless Safety Levels 2 or 3 Standards are met.

4. Short shift kits which only change the length of the shift rod attached to the gear shift knob may be installed. Kits which change other linkage, mounting brackets and/or tension through springs are expressly disallowed.

5. A hole may be added to interior body panels, the engine compartment, the trunk, and/or a strut bar to provide access to the adjustment mechanism on a shock absorber. The hole may serve no other purpose and may not be added through the exterior body panels.

6. Any item that cannot be held permanently in place by factory-installed fasteners may be removed.

7. Spare tires, tools and jacks may be removed. Any fastening hardware and/or other pieces that can no longer be firmly secured in the absence of the spare tire may be removed, if necessary, to ensure compliance with safety inspection requirements.

8. Data acquisition systems (including video cameras) and the accompanying sensors are allowed but may serve no other purpose during a run than real-time display and data recording.

9. With the addition of Safety equipment, the following allowances apply:

A. If the vehicle is equipped with at least a 4-point roll bar, driver’s seat, and restraints meeting SCCA Time Trials Safety Level 2 Standards:

1. Rear seats carpet and trim behind the seats may be removed.

2. 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.

3. Airbags may be removed.

4. Airbag-equipped steering wheels may be replaced or have the airbag removed.

5. Convertible soft tops and related structure and brackets may be removed.

B. 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.