I have just fitted one of these to my MY98. It's now misbehaving, in that when on WOT, it makes the car lose all its power at about 5k rpm in 1st, 4k in 2nd, and so on... I've adjusted the adjustment bolt to about half way in, and still no avail. Any ideas?

 

do you have a boost gauge what pressure does it start loosing at

 

Sorted it. Found a lip in the connection of the intercooler pipe. Boost leaking from there. Doh!