MRA is fun!
all you need is a full cage. then get it AASA log booked. You'll need at a minimum the level 2 AASA licence which is around $60 a year. you'll need to do an OLT at wakie for that - easy as - speed of the streets day.
MRA has a whole heap of different cars....mx5's, commodores, utes, falcons, torana's, kingswoods, protons, swifts, wrx's, bmw's, silvias - if its got a cage - it'll be there!
thats me going slowly down the straight in the middle of the pack LOL
normally around 250 - 270 a round which I think is the cheapest out there.
the car itself pretty much needs a full cams approved roll cage, normal stuff also like harness, suit, gloves, shoes, helmet, fire extinguisher.
My MX5 was built to CAMS 2F spec prod sports, but thats too expensive for me to race in at the moment so MRA it is.
Some guys race in MRA and Irace also - Irace may have a few more rules and regs but pretty easy to understand and follow