Motorkhana Queen

I am the proud owner of a FC RX7 Series 4 '89' which is completely stock even down to its exhaust system (sounds too quiet 4 a rotor!). When I first bought it , she only had 52,000 kms on the clock!
Now it has done double those original kms and it is up 4 new shocks. Was wondering what were the best ones to go with? The original suspention os 8 setting ajustable, which I find is a advantage at Motorkhanas, skidpans and hillclimb events.
Also once I start to get some extra cash up I would love to do some work to it but the only problem is i cant get too carried away because it still has to be used as a daily driver and unfortunatly I don't have too much money to spend on it....
So my next question is what mods do I go with to get the most out of it on a tight *** budget?
Was definatly thinking 3 inch exhaust?
Was thinking of upgrading the chip and maybe a front mounted intercooler?
What products have the best rep?
I know that what ever I go with it has to be good quality and last. Even if that means doing it in stages.
Also where do I go? Keeping in mind I live in Queensland Austraila. I heard Mazfix?