c270cdi no turbo boost

[Snoop108]

Hi folks, I carried out alot of work to my c270 there. De-flapped the inlet manifold, with stepper motor delete, EGR cleanout and resistor delete, and 2nd cat removed. I took the car on a test spin after, and all seemed great for about 20 miles. Then no boost from turbo, and an exhaust note change. The turbo was a whistler, but noise has gone to. Boost pipes look good with no sign of leaking. Turbo spins nice and easy by hand, and no sign of back and forward play. No un ususal smoke either. Any ideas?
Thanks in advance, David

 

[Snoop108]

Oh and no sign of limp mode, just down on power.

 

[Snoop108]

turned out to be simple. EGR vacum pipe had popped off