HI all im new here! ive just fitted a 1.9tdi AHU into my mk2 golf, i dont really know much about diesels and i really want to tune it as its only 90bhp at the moment, i dont have a massive budget, so far is has been decated it will have a 3" downpipe made and it has a fmic. what else can i do without spending silly money on it? any help would be much appreciated!!
ps are the £30 tuning boxs on ebay any good???