I've done a fair few track days, with a l81 General Motors 2.5 V6 engine, but in a Saab 900.
1] Pay and play trackdays do indeed exist. May I suggest you use one of the more structured events orgainsed by the likes of
www.bookatrack.com - well drilled, well martialled and very supportive of first timers. Hire a pro driver on your first time out! Worth every penny.
2] Junk as much surplus as you dare, but why throw out the heater if you do winter trackdays? Winter is cheaper
.
3] Not all cars need to be road legal for a trackday; just sort out how to get it to and from. SORN it off the road etc.
4] Some trackdays are specifically road legal check the small print of each event.
5] I wonder if the TC function can be disabled via the tech II ? It is easier in the fwd cars as there's an extra throttle plate that you simply remove.
Don't be surprised if you get your backside spanked by some 'inferior' cars, you'll have no idea [unless you later ask] what sort of power train it has, what fuel it's using or how experienced the driver is. Most regulars at trackdays will talk to you and explain how they've got a little more from their wagons; there are forums dedicated to track and performance to, petrolheads springs to mind.
Personally I woudn't track an Omega; I would certainly go up to 3.0 or 3.2 though.
Brakes
don't skimp here. I'm towing with my Omega and I use EBC Redstuff on the front with slotted rotors and Greenstuff on the rear with slotted rotors - can you imagine what my track brakes are like? And that's a car 300kgs lighter and more powerful than a stock 3.0
AP Racing front brakes;
300mm vented rear brakes ;
221bhp 3.0 V6 ;
busy at Rockingham a bookatrack event with open pitlane .