2.4 turbo surf slow to boost

Couple a hundred give or take will get a two and a half inch system from just under the turbo right the way through with a straight through muffler. Makes a big difference to low down spooling. I also packed the vacuum control on the waste gate with 1mm washers to increase boost to max at 9psi used to run on
2-3psi cruising.
Others might bag it but it worked for me and I did about 300,000 before I traded.

Just check if there is any tubes coming from the waste gate and going to the fuel injection pump, they may have come off or have a hole in them. I am not sure of the set up on the 2.4 Surf, and also is the turbo making any strange noises could be on the way out, anyway something for him to look for.
Cheers Bruce.