What is the image of above? It looks like a bleed valve placed in the ECU vaccum pipe?
Seen this done before, because it alters the retard/advance on the timing - making it go better (for a short while)! It shouldn't need it to run ok though.
That filter and bleeder are needed
- Umm.. why? It should run ok without a bleed valve there - enless ECU is buggered? Might be the vaccum sensor in the ECU is not working right - therefore adjusting the timing and also thinking it is overboosting even at only 0.1bar - hence the banging and popping.