Discovery Td5 Automatic - Part 2 (Stage 2!)

The Disco Auto from a few episodes ago, is back, and now its running well!
So much so, that our customer has asked us to take it up another notch by fitting a more efficient performance intercooler and turning the wick up some more on the engine.
So what caused the low power previously? Watch and see!

[@jonathanperfitt9649]

Why would you do all that work and not delete the EGR valve cheap modification and it’s going to help with performance when the engine is sucking in clean unburnt air?

[@JimBiddle.]

At what point do you need to start thinking about a bigger (VNT?) turbo? Would that be a Stage 3? I'm guessing, if the customer put a straight through exhaust, that would help, but would you feel a bump in performance just from that? Finally, are you going to feel the benefit from the larger intercooler, if you aren't towing? Sorry for all the questions, just trying to work out my next move.
Just for reference, my Disco has:
An NNN ecu that might (he didn't know for sure when I bought it) have a stage 1. (It had an MSB one before that which seemed to be wrong for a 15P)
Standard exhaust system, including CAT. (Thinking about trying a straight through)
EGR delete. (Just done)
Think that's it as far as anything that would affect the performance, goes. The previous owner, basically threw the Terafirma catalogue, at it underneath.

[@bencooper6616]

What sort of RPM does the turbo pick up at? And what sort of RPM at the auto at at 70mph?