http://www.ukstarletowners.com/page/articles.html/_/tuning-4efte/stage-1-200bhp-stock-engine-stock-turbo-r35 Go through this it's all there think about mapping last after you get all the mods together, if your only looking for 180bhp then a plug n play ecu such as blitz, JAM etc will do the job alot of people go for the e manage blue route for the price of a plug n play but it's up to youif I was you my next mod would be a blitz decat get things flowing better