depends how you want to do it to be honest......

I suspect that he had a simple two stage boost switch fitted and if so, no more than £50 fitted id expect...

If he really did have a map switch then on a cossie thats £200 plus the cost of your two maps and installation of tyhe dash switch. We can incorporate your own 2 maps into the chip if required. Generally speaking, the only cars likely to actually require this are cars with a seperate map for high octane race fuel or a car running a dry nos system. The maps can be switched live as well.

But its there if you need it.