You can just bolt the K03s straight on. No other parts required apart from oil, filter and coolant.
It will run without a remap, but could cause some problems, overboosting, limp mode etc. I'd say minimum, £200 for turbo, then £250+ for map. So £450+ really.

To get the most from it, silicone TIP, 3" downpipe and front mount intercooler with a stage 2 map for the K03s would see the most benefits
 
Plus the cost of oil, filter, coolant and washers and gaskets for new turbo. Probably another £50-70
 
Ko3s transforms the ibiza, you will need a turbo intake pipe, standard one won't fit over the turbo.

More recent development is seeing good power gains from the ko3s also. Years and years ago my ibiza was one of the first ko3s'ed Ibizas, made 234bhp with jab a map (only people mapping ko3 cars at the time).

As already said your need a fmic to see the full potential
 
My TIP, ko3s, Forge front mount & Milltek downpipe will be for sale soon (just waiting for weather to get better), it made 248 bhp on Jabba rollers. Just getting the parts together for a GT2871.



Pete
 
Is The TIP For K03s Different To K03 Then? Will I Have To Buy A K03s Silicon TIP Then? I'm After Blue Silicon Pipe Work Pete And How Much You Looking At For The Lot?