You will have to have the car remapped again with your next choice of turbo. Hopefully somebody will be along in a little while with some turbo suggestions for your car. The best of luck to you!
The KO4 or hybrid KO3s is the way to go. AwesomeGTi in manchester should have some options for you. You could be looking at around 300bhp with these upgrades!
I'd also get a better intercooler as well and uprate the divertor valve as well.
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When it comes to pricing - the oil companies have us all over a barrell!