I would like to make my 200tdi perform a bit better, I've got a boost pin and have adjusted actuator arm, to be fair it goes well but any advice to make it quicker?
Was gonna get full size intercooler, does that make a difference??

It does. I have one. I would not go back. You do need to inform your insurers tho !
Mine was from here:-

http://www.jeremyjfearn.co.uk/intercooler.htm

Do a search - there should be quite a bit of info on here