can you upgrade the deisel injectors to anything to give a gain?
no point unless you're going hybrid
stock injectors are good for 250bhp ish
Its the turbo that's the limiting factor with diesels. For example mine's running near the limit of the boost available but there's a fair bit of headroom with regards to the fuelling though you'll end up with a very smokey back end
Holy grail is power with minimal smoke.