Don't want to alarm you, but if it is pinking on full boost you have already pitted your piston and will probably kill a/all pistons very, very quickly. Pinking is pretty un-mistakable, and a cringe worthy noise, and tends to do it in higher load, higher gears, and around the 5K rpm area so doubt the its that.
Is it defo engine area ?, else perhaps an exhaust baffle ?. and is the downpipe bolted back properly. Have seem many aftermarket downpipes fitted only using the main flange bolts and not bolted back on the brackets further down, which as a result can then rattle and cause stress on the turbo flange.
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