Quicker around any NZ track... possibly for the first four or five laps (less if its Hampton Downs International or the full Highlands Park track), then the brakes will start to be an issue as you haven't upgraded those in your shopping list, shortly after your road tyres are going to be overheating due to the tread blocks moving about under load, so you'd need a set of semis at least, missed off the list. Then you'd be sick of rolling around like a Spanish galleon through corners, so you would need a new set of adjustable shocks and springs, all times two of course as its for both cars. At which point you then find out how flogged all your bushes are so they all need to come out an be replaced. So now you have an EVO that can stand up to a decent track day, or even race event, oh but wait, the piggy back ecu and tune has now caused the over-stressed engine to blow a foo-foo valve because none of the cooling has been upgraded on the shopping list. So that's a rebuild (or two) and while you're in there you probably want to go forged internals, chuck on a bigger turbo, and do some head work. How much are we up to by now..?
Once the engines all back together and been on the dyno for a good few hours to be broken in and tuned, you should be all good to go back to the track, at which point the 250,000km gearbox and or centre differential decides it's had enough of all this extra torque and abuse and lunches itself. It's about now you start to think to yourself what was that expression about fast, cheap, reliable racecars again?
Thanks for your input Tony Quinn, unfortunately a lot of those "Gentleman Racers" don't have as much ability as they have available horse power in their cars, so can be almost as much an issue as the Flat Peak Cap brigade in their cheap Evos at Pukekohe track days.
It does if you don't take it to the track and just keep it in the garage... but where is the fun in that. Or you can do what I do, and have a racecar that never makes it to the track and still costs lots of money each month, I must be going wrong somewhere?