Daz69 wrote:

Well I guess that one was a little hard so let’s try another.
With a split in the cross over pipe would that make the exhaust smoky on acceleration?
I do have the egr’s blanked, not sure if that would do it either
Cheers
Daz

I think it would depend on how much exhaust gas is escaping! If there's not enough gas flow to spool up the turbo correctly there will be insufficient pressure build up on the induction side!

For that I think there would need to be a sizeable leak, and the effect would be similar to a split induction hose resulting in black smoke (insufficient combustion) under acceleration.
The exh temp route might be a good approach in diagnosing how serious the leak is, once you bear in mind the the crossover pipe may well be a cooler temp with the engine at idle! (Different material)

One test suggestion might be to go for a run using lots of short acceleration bursts, and then test the temps at the manifolds and crossover pipe. The actual temperature itself is not all that important, but any significant temperature difference is!
I would say under normal operation the manifolds should be the same temperature, with the perhaps a slight difference at the crossover pipe. However, any lower deviation in temps would raise suspicions of low gas flow to the turbo.
It's only a theoretical view point, but I hope it helps.

 yµ (idµ - eAµ) ψ=mψ