Hey Millzy, Do you think you can throw up a few pictures.
I may have the same problem. I put my hand ( when the exhaust is cold.. Start up ) near the up pipe and turbo, and I feel air puffing through, Also the gasket is really flakey..
I have a 96 rex. Im also feeling a little loss of power down low and and have a pretty prominent whistle while boosting.

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Dont think I can fight this anymore, Im listening with one foot out the door !