Can you help me diagnose this knocking noise I put new parts all over the engine but did not touch the blok. It is a 6 bolt engine. The noise apears only above 2500-3000 rpm and I do not have any trouble reving up the engine. Engine check light is off. I am thinking maybe it is the balance shaft...

I’ve got an almost fully built 6bolt 4g63 in my 95 gst with aftermarket exhaust and what I was told is a black box tuner.The previous owner told me it was never tuned since all the aftermarket stuff was done to it and that it will run a lot smoother once tuned. I’ve read a lot about tuning...