Welcome aboard Samuel........please make yourself familiar with SAU forum rules and feel free to ask any questions relating.
On the subject of mods, there is another SAU-SA Club sponsor that you may want to consider for advice before commencing......WILLALL Racing @ Gillman.
Martin from Willalls will steer you in the right direction with advice on "bang for buck" mods..........you may leave surprised as to what constitues value vs wasting money on so called obvious mods, ie. sometimes pods and intercoolers can be a waste of money in certain situations. Dion's advice, re a mechanical check-over and complete service is a good one and needs to be your 1st port of call.
The other reason that I recommend this mob is because all their testing is done on the track and not just a big (often useless) number on a dyno..........big numbers don't always mean quick cars.
SAU-SA Club has the occasional track day, so you may want to consider whether this is for you as well.........all the best.