kameleon
It is hard to differentiate the cars even road to track cars sometimes.

My AW11 is in a big grey area, it's appears heavily modified, but it's not.
 
Suspension - The suspension modifications are mainly stiffer springs (3kg/6kg), I'm still using stock replacement Koni Sport shocks and I still run the car at standard suspension heights. No RCA's or fancy replacement suspension links. I run an adjustible sway bar on the front and a recycled SW20 sway bar on the rear.
Engine - The 20V engine conversion looks like a heavy modification on paper, but it's an unopened stock motor with a basic aftermarket ECU. Toan's worked 16V would easily make more power with it's much bigger cams, lightened flywheel, ported head and Autronic ECU.
Brakes - The brakes upgrade is just a combination of stock brakes off bigger cars, ST185 twinpots on the front with non-slotted Corolla 254X25 rotors, SW20 22V calipers rear with a non-slotted AW11 front rotor. It's an improvement in braking power, but mostly in thermal capacity due to larger rotor mass, but it's added 2+kg per corner. It's not like they are $2k worth of Wilwood billet calipers and two piece rotors. The brake pads are cheap $80 TRW Track pads, nothing special like $300+ Ferodo DS2500's or Project Mu HC+
Exterior - The bonnet vent, it's looks like a massive aerodynamic enhancement, but it's just for better cooling (in theory anyway). There are no splitters, under trays or wings.
Interior - I've stripped the carpets out, but still retain factory dash, centre console and door skins. I'm still using a stock recaro bucket seat and seat belt as well.
Weight Reduction - I've ditched the non working AC system, heavy thermo fans, carpets and rear wing. This bring it down to 1060KG, the nearly same weight as a stock JDM 84 AW11a.
The majority of my modifications could be replicated on a tidy stock looking street car and you'd never know.

There isnt much diff between modified street and circuit, as said there could be cars more modified then some of the 'circuit' class but as they still have it registered and as a result cant have a roll cage. Yes a race car should have a cage for safety, but it could be stock otherwise, and the cage which is mainly safety, will just make it heavier.
It should be that if you have a modified street car that exceeds the rules it will get bumped up into circuit class.
 
Few extra things that can be added like as mentioned weight reduction and interior;
 
Interior
Street - Full factory interior must be retained including complete factory dash, factory seats, door trims, carpet ect
Modified street - As per street class however seats and rails me be replaced with an alternative but the number of seats fitted must be as from factory. steering wheel may be replaced with alternative.
Circuit - Interior is free.
 
Body
Street - Must retain original panel material and shape
Modified street - Alternative panels are permitted for the front bar, bonnet, side skirts, rear bar, boot and engine lid. The remainder of the vehicle body must remain as original from the manufacturer.
Circuit - Body is free
 

I don't care which class I'm put in. I just want to thrash the shiz out of my car on the track. I'd be happy if I was the only one there.
Forget about classes guys. It doesn't matter.
If you win a trophy, it will end up in a cupboard and you'll eventually throw it out anyway.
Turn up, have a blast and go home with a smile on your face.

Last I heard those plaques were valued at 3.5 million dollars so i can understand the concern. i agree with Admin. It's a great value couple of days so just turn up and have fun

If we want rules for classes, just use the ones CAMS use for Supersprint events

Thanks for the feedback and point of view on the classes and what people feel it should be. 
Admin, the EVO was not a standard road car which is what Street Class was this year. It was modified beyond standard so it was placed in Modified Street. Two piece rotors are not stock. 
I have looked at the supersprint reg's but there are too many classes which doesn't work. Good idea, but will not work for us. These reg's are closer to WTAC but structured to suit the demographic of the MR2 owner. Bascially, there are no extreme MR2 circuit cars. Most are modified to a similar degree so these all end up in the same class. Most have suspension mods with some minor engine upgrades, sound upgrades and decent tyres. These fit into Street Class. Cars which are the more highly modded street cars are the same, except they have power upgrades with a mild improvement in weight reduction and the odd car has increased track and a brake upgrade. Circuit cars are the same with more weight reduction and a improved safety and a cage. A point being, the roll cage is not just safety, the cage is a performance enhancement if done correctly. So a street car with a cage has an advantage. It does cost 30kg of weight, but you do gain with a more comprehensive chassis.
Harnesses are also a advantage and a excellent safety addition. I would be happy if everyone had one fitted but that will not happen. It's just what I would 'like' to see.
As far as not having classes and competition, that cannot happen. It's a major part of the event, it stimulates conversation, enthusiasm to improve your driving and car to try and 'top' your fellow driver, creates great memories and stories, makes you drive harder and better. You can drive in the event, enjoy the tracks, not bother about where you finish, but if your keen on the stimulation of competition you can go for it.
 
I'm going to talk with Wakefield Park about a cruise session for people who want to drive to the track, meet and greet, then do a few laps with their partner or friend. So, not a competitive or speed orientated drive, just cruising at 40-60km/h on the twisty bits, then up to 100km/h on the straights. It's just to allow people to have a drive of the track without the pressure of watching their mirrors or exceeding their comfort zone, allow the show cars to have some low pressure laps, allow your girlfriend, mum,dad, grandparent, whatever to drive the track with non risk of incident. What do you think? 
 

This kind of thing has crossed my mind!

I just had a look at powercuise burn outs. Everyone will need a trailer and only a one day pass..
The idea of cruising the track at a slow speed then a hit up the straight will appeal to a lot of the street cruisers. They can have a club cruise to the track, lunch, enjoy the backroads around Wakefield (there are some nice quite roads around the area which are great for photo shots), show up after 12pm, park and show their cars in the open garages, sign in, come and meet everyone, have a cruise session, then the UTC photo shoot, bbq, party on with all the competitors and crew, then a few more sessions on the Tuesday before heading home after the presentation.
A few awards can be organised but this is something I would like to see the clubs get involved in (managing a show and shine) as I have enough on my plate.
A 1/8 mile was considered but I didn't like the run off in case of a problem.
Drifting is another option but don't think it will 'fit in' as there are not enough MR2 drifting right now plus time restraints.
 
Here is a flyer I put together. If anyone can improve on this (should be easy), please load to the thread.