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head unit

  1. Focus ST Builds
    I know the stock engine is good up to 350/360 with a big turbo, plus with aux fuel up to 440/450ish. I know to go beyond that you need a ‘built’ engine. I am wondering, is this a build cylinder head or the block or both? What parts are generally upgraded when building an engine for more power...
  2. Focus ST Electronics
    I just bought a 14 ST ST1 and looking at upgrading my head unit to a BP800Play that I had in my previous car and had no problems with. What harnesses do I need to still have control of my steering wheel controls? And is it worth just paying a shop to do?