preza si

while at trax today on the circuit, the car was running fine for the first few laps, then the boost started to play up. started to over boost then cut the boost off. after a while boost had gone complety. once back to the sidc site checked under the bonnet and the actuater/wastegate were stuck open, closed that up and boost came back but was making a very odd metallicy noise. on the way home the boost would over boost then go down then come back on again. the noise would come on worse when then the engine was on run down, press the acclerator and it goes away. did lose all the boost again tho. some said maybe a hole in the wastegate? what do u guys reckon? looking forward to here your thoughts. thanks, simon