[slick3]

Originally Posted by Egon

I have discussed the 1LE with a few of my SCCA Autocross friends and assuming that the 1LE is faster than the GT350 (non R version) around the track we think it is unlikely that it will remain in the F-Street category. The GT350 is in A-Street and the GT350R is in Super Street so it would likely fall into the A-Street Category with the non R GT350. I believe that if the 1LE is allowed to remain in F-Street it will totally dominate the competition without needing a single modification.

For those of you considering SCCA Autocross and would like to get an idea of where your car would be classed with your planned modifications here is a quick reference list of all of the modifications allowed in each of the street classes from lowest to highest. (Street is the least modifications and Street Modified is the most modifications) Keep in mind any modifications allowed in a lower category are also allowed in the higher category, for example Street Modified can perform any modification allowed in Street, Street Touring, or Street Prepared. If the modification is not listed it is not allowed. In addition the Street Touring category has additional wheel and tire limitations with a maximum of 10" wide wheels and 285mm tires for STU where the Camaro would be placed, so the 1LE would need a tire swap to compete there. As you can see from the list a 1LE with a tune and its stock 20x11" rear wheels will instantly be moved to Street Prepared since the tune would bump it into Street Touring but the 11" wheels would be ineligible for STU and it would bump it further on to Street Prepared.

Classic American Muscle (CAM) is another option but is a completely separate class from the Street categories and is basically unlimited.

Street Category

• Air filter element (replace or remove, no “cold air intakes”)
• Battery and hold‐down bracket(s)
• Exhaust, “cat”‐back or axle‐back
• Anti‐roll/sway bar, 1 front OR 1 rear (replace, modify, or add)
• Shocks/struts (replace)
• Brake pads/shoes (replace)
• “Comfort & convenience” (gauges, lights, etc; add, not remove)
• Shift knob (replace)
• Seat belt, restraint, harness for driver (add, not remove)
• Spare tires, tools, etc (remove)
• DOT tires (any size, UTQG Treadwear 200 or higher)
• Wheels (replace; diameter change ±1” allowed, width must remain the same and offset ±7mm )

Street Touring Category

• Anti‐roll (sway) bars (replace, modify, or add)
• Battery (relocate, behind seats)
• Big brake kits
• Bushings, suspension/steering (replace)
• Camber kits/bolts
• Cold air intake, up to throttle body or turbo inlet
• Engine accessory pulleys except supercharger
• Engine and transmission mounts (replace)
• Exhaust headers and high‐flow “cats”
• Limited slip differential, 1 only (none allowed in STS and STF)
• Pedal covers and “dress‐up” items
• PCM/ECU reprogrammed fuel and/or ignition map(s) or fuel pressure
• regulator (no changes to “boost” maps)
• Seats, front (replace)
• Shift linkage kit
• Strut bars, tie bars (2‐point; add or replace)
• Sub‐frame connectors for Mustang, Camaro (bolt‐on only)
• Suspension springs, “coil‐overs”
• Valve timing controllers (add)
• Wheels, any diameter; wheel & tire width determined by class (STU for Camaro is limited to 10" wheels and 285mm tires)

Street Prepared Category

• Update/backdate complete components (engine, transmission, etc)
• Fenders for tire clearance (modify or replace)
• Steering wheel (replace)
• Spoilers/splitters, small (add)
• Radio/stereo removal
• DOT tires (any size, any rating)
• Wheels, any size
• Brake ducts
• Ignition, fuel, and air induction systems (modify or replace)
• Emission control systems removal
• Coolant radiator and fan(s)
• Clutch and flywheel
• Limited slip differential(s)

Street Modified Category

• Engine and drivetrain (engine block mfr must match chassis mfr)
• Fuel cool‐can
• Fuel cell
• Suspension components
• Steering components
• Steering gear and/or quickener
• Fiber engine cover, trunk lid, bolt‐on fenders, etc
• Rear seats (remove)
• Aero wings (add)
• Splitters, large (add)

Classic American Muscle

• North American GM, Ford or Chrysler
• Must be Licensed and Insured and in street legal condition
• "Finished Look" interior
• Body Modifications extensive but see rulebook
• Brake Suspension and Steering unrestricted
• Engine and Drivetrain unrestricted
• DOT tires with UTQG Treadwear of 200 or higher

Excellent information! I have one question though… You mentioned a – street as the category it would likely fall into. I do not see that category listed in the information you provided. If you wouldn't mind could you please elaborate on that specific class? Really helpful post thank you