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Perhaps something has gone funky and it isn't providing that extra holding pressure its supposed to. If its working correctly, you've got quite a bit of backpressure holding it open.. Curious, do you have a/f's or egt's in the car? If backpressure is creeping, the cylinders should start leaning/heating a bit more than normal in that pressure range.. Or, maybe your wastegates just aren't strong enough. :) I'm just thinking outloud here. :)
MikeeZ Twin Turbo, Almost BPU |