Re: New turbo for 156 2,4 JTD 10V
If its the 136bhp version then you have the VNT25 turbo, the later 140/150's had the GT2256 which is a bigger turbo.
I don't know of an easy upgrade from the VNT25, if its the GT2256 then its good for over 200bhp anyway.
As far as claims for 200bhp from the old 136 go, I wouldn't pay too much attention to them unless there is a rolling road before and after, and even then just look at the differences.
Pud had a 136 with a 200bhp map, but I seem to remember him saying it was a little short on the claimed power? - you would need to ask him.
Don't know if you could fit the GT2256 turbo and manifold from the 140? People have spoken about it but I know of no-one who has tried it...