If we are talking about a completely standard EK9. With 2k to spend for purely track upgrades and No labour charges.
Assuming you have fair experience on track in a Civic, your tyres are in good condition and that the car is in good condition to start with. Not needing any repairs, new bushes, LSD not worn out ect...
Strip any unneeded weight (rear seats ect) = Free (Plus full aircon delete if fitted) £5 for belt
Decent pair of solid light bucket seats and harnesses to keep you in position = £400
Assuming standard discs are in good order. A decent set of pads all round should be enough to start with = £200
Gear set 3/4/5 = £500
Decat and decent Ex system (Min 60mm) = £250 (second hand or cheaper if you can weld)
Set of decent Used coilovers or shock and spring setup = £400
Decent Geo alignment and corner height setup = £80
Baffled sump = £50 (weld in plates plus new gasket)
Seperat Oil breather bottle (no breathers into intake) = £20
Then the rest spend on track time and petrol
All approx cost, some and more can be found allot cheaper if your in right place right time.