
Yes, for the last 6 months i've been running me van with no air filter. However, I have now fitted one and the van seems slower. Where as before I could accelerate and feel the turbo kick in and pull the van but now I dont get the turbo kick anymore.

2 questions:
1. What harm does running a van with no air filter do?
2. Should I be worried about the lack of turbo kick?
I also changed the fuel filter, oil filter, oil and used a fuel treatment. I topped up the diff oil and the gearbox oil (i have a small leak)
edit: this is a 350 lwb 2.4td