Default Rule

If a class does not explicitly allow something, then it is NOT allowed.
Higher classes are allowed everything lower classes are.
OEM Mod through Pro Mod must retain OEM driving location and must be drivable by an individual from that location.
Speaker sizes are determined by diameter of cone as measured from half surround.
Dash pods are considered to be any fabricated item that is taller than .75 inches above the dash surface.

OEM Mod

READ THE DEFAULT RULE
External 12v specific processing allowed
Up to 2" speaker in A-pillar, quarter window, custom free standing pods, or sail panels. Large flange tweeters allowed
Kick panels up to 6.5” driver
HLCD Allowed
Any modifications under OEM locations can be made.
Grills may be modified or replaced for acoustic reasons, but may not exceed the oem size and must still be a grill. They may exceed the height of OEM grill by no more than .5".
Oval drivers: 5x7 can be replaced with up to a 6.5”. 6x9 can be replaced with up to an 8”. Cutting allowed to accomodate this rule.
Can change double din to a single din
Can add dampening and sound treatments not visible behind panels
Commercial dash mats allowed
Single cab trucks will allow sub enclosures under seat or against back walls
Convertibles with NO trunk space when the top is retracted may have a behind the seat sub enclosure
Extended cab and crew cab will allow under back seat or against back wall
Trunks may have house subwoofer enclosures or IB installation. No metal cutting allowed for IB install.

READ THE DEFAULT RULE
25 square inches of dash corners may be modified for dash pods or dash openings
Dash pods may house up to 3" driver
A-Pillar, sail panel or quarter window may house up to a 3” driver (as defined by the cone diameter) and 1" tweeter.
Kick panels up to 8" speaker
Doors up to 8" (unless OEM is larger, then may replace with same size or smaller speaker)
Cutting material allowed to accomodate an existing rule. e.g. opening up an existing speaker hole, moving material under a dash grill, etc.
Cutting material for IB subwoofer installation. Examples include rear decks, trunk floors, cabin flooring.
Modified 110v processors allowed
Seat rail extensions allowed
OEM vehicles equipted with up front sub woofers allowed if the location and overall enclosure size is maintained.
Up front passenger footwell subs allowed. Dash subs still move to pro-mod.
Rear seat may be deleted.

READ THE DEFAULT RULE
Dash pods may house up to 4" driver
A-Pillar, sail panel or quarter window may house up to 4" driver (as defined by the cone diameter) and 1" tweeter.
Center console subwoofers
Up front subwoofers in any location forward of the B-pillars (moved to modified for 2024)
Custom built dash mats are allowed up to a thickness of 3/4"
Full custom doors
Cabin cutting allowed, beyond IB subwoofers. This means putting a hole in the cabin where one did not already exist. You are venting outside the cabin, regardless of where that hole leads to.

READ THE DEFAULT RULE
Anything goes, your imagination is the limit as long as the vehicle is safe to operate and can drive into the lanes under it’s own power.

2 seat scoring will be comprised of averaging the tonality from left and right seat, and adding everything else.