I'll be honest with you... being on stock exhaust in a tuned car is really not advisable. You are running increased boost in this case, more heat, and judging by the way you drive -- probably doing extended full throttle pulls. I can pretty much guarantee you that there are already hairline cracks in your turbine housing and possibly where it mates to your manifold.
The hammer comment I was being serious, but one check you should really do is to just pull your downpipe off (3 bolts). Have a look inside your turbine housing for any cracks near the wastegate.
If you're down here in South Florida, getting an exhaust fabricated is really straight forward and there are some really talented exhaust shops down here.
Get rid of your stock exhaust. Check your turbine housing for cracks since you've been pushing it hard. Hammer down on the wastegate arm to make sure it's sealed. Also check your wastegate pressure to make sure it's in line.
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