motorsport developments sell an evo chip which you can fit
yourself very easily for £140, its the bollocks mate,
i have just bought one and it allows unlimited boost which
future proofs your car for any further mods you carry out.
forgot to mention, the chip is a buy it now item on ebay and i
promise you it works very well compared with the other chips
i have owned i.e. P.T.S and Superchip.