Also, just on the question of mods and rough expenditure so far, from my view.
If I had my time again, the order in which I'd do things would be:
Brakes (Calipers Reco'd and Comp Pads, also braided lines)
Suspension (lowered, firmed, custom springs, all bushings and control arm bushings etc. Shocks - new or old but re-built for track use, basically firm up the entire suspension / steering assembly)
Steering wheel (good sports wheel)
Tyres (semi-slicks of some sort - yoko a048's as mentioned previously)
Diff (3.46:1, CIG Locked)
Weight reduction (absolutely everything that doesn't need to be there)
Cold Air Induction (560SEL air housing or custom piping to gain clean cool air)
Throttle Linkage adjustments / tuning & also Air/Fuel mixture tuning (on dyno)
What I've done, and costs:
Timing Chaing, Guides, Tensioner etc - $900
Leads - $200
Rotor Button & Dist Cap - $250
Brake Calipers - Reco'd $4-500? (can't remember, Styria can note this)
Brake Pads, QFM Comp 3's - $500 (is that right Ian) for front & rear
Suspension (everything mentioned above) - $2,400
Tyres (been through a few 2nd handy's but for new ones) - $1400 [4 x yoko a048's]
Weight Reduction - Time
Dyno Tune - $50
Diff - $300
Services (Oil / Filter, Transmission Filter / tranny oil, Plugs etc) - at least every 2-3 events - $unknown
Miscellaneous hoses & other small parts - $2-300
COUNTLESS PARTS / EXPERIMENTS FOR DEVELOPMENT PURPOSES - $$$$UNKNOWN - but definitely not less than about $2-3k
(This included different heads, diff's, intakes, and other misc parts)
Most of the time the development would reach a stage where the realisation was it wasn't worth proceeding for the outcome.
I don't wanna scare you Michel, but if I were to count everything i've spent on my track car to date (including prior to it becoming a track car), I'm confident it would be somewhere between 10-15K.
With the next project being a re-grind of CAMS, M116 Heads & Possible Forced induction - that figure will probably be pushed to around the 25K mark - if it goes ahead.
Who know's where it'll end up, and thank christ that my Dad doesn't know how much i've spent on the car.
All in all, doesn't matter how much you spend, the main thing I take away from my time on the track (and much thanks to advice that Ian has provided from his years of experience) is the skills that I've obtained from doing this.
Cam.