OK Let me try again (but it's still a piece of string)
I'll do the SC as it's probably the best for what you want and I have more knowledge on that than a TT
Firstly you will need a kit Vortech is the most popular - New around £4,500 pre-owned £2,000 - £3,000
Possibly a new zorst and some de-cats £400 - £1500 again depends what you have and what you want / need
New injectors and FRS - £350 - £800 - again depends on spec, new or used and exact requirements
A few must have supporting mods - at least 1 wide band AFR gauge and a boost gauge - oil temp is useful as well. £200+
Other useful mods include an oil cooler not essential but handy on an FI Zed.
Mapping and dyno - assuming you go uprev as it would be the easiest and cheapest for the above at least £500
Labour - if your doing it yourself fine £0 if your getting it done for you probably £2000+
pick the bones out of that
Also please do bear in mind if your gonna throw another 100 - 150 HP out of the back wheels then it is not the worse idea in the world to consider supporting mods like -
Brakes
Suspension (springs and shocks)
Bushes
ARB's
etc.
Also think about it very carefully there are a lot cheaper cars to get the power and speed out of for less money!
Lastly - if I were you I'd do it the other way round -
Sort the brakes and suspension first, get some decent tyres and a bit of tuition on track - That will make you and your Zed faster. see NeilP or Jez from Horsham or Buster (to name only a few) who have quick well setup NA Zeds!
Then if/when that's not enough look at FI as a possible route if your keeping the Zed, read everything you can find and start looking for deals and 2nd hand kits coming up.
Hope it helps