Finally got round to replacing the standard airbox with k&n panel, built my own induction kit and got rid of the crossover.
The improvement has been REALLY good, I used a 60mm 90deg. bend to fit over the metal turbo inlet pipe, going to a 45 deg. 60mm ally pipe, then to 70mm to 60mm reducer, MAF sensor then cone. I used the original ram air pipe and pipe from airbox to MAF to provide a cold air feed(due to put in more cold air feeds along with the cone heat shield).
The performance has increased significantly and the sound - WELL that has improved no end. You can now hear the turbo spooling and the dump valve is louder.
Horses for courses though. I am happy
Will post up a picture shortly.
Viper performance 90 degree 60mm silicone hose.
Viper performance straight reducer 70-60mm silicone hose.
Viper performance 45 degree 60mm ally pipe(cut down)
BMC vacuum hose take off adapter(breather to catch tank)
Universal air flter(temporary measure, until green/k&n ordered)