Does it tap on idle? Just cold or once warmed? Mine taps momentarily in startup where oil is getting thrown around, but stops immediately once running. Mines on 115k and could do with an oil change now too, plus running 5-40 oil too whereas some say 10-40 would be better.... Either way, runs great and no noise on or off boost when driving.
It's always an unknown as many will say, luck of the draw I guess. I may be having a further map on mine to take into account the larger intercooler but you never know eh some have run 400 on standard wrx internals with no issues with others having less bhp but on Sti and still had issues. My opinion is if you look after it and don't thrash it every time you drive it you'll be fine no matter what you run (within reason...).
My dad has had his Sti bug for 5 years and covered over 90k miles in that time as a daily driver. Now on 135k and no issues at all.
A very light tapping on idle should be fine though, most do this. Just the type of engine. Could be noisy boost solenoid or anything, but I doubt much to worry about if it is barely noticeable.
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