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if you like your bolts rattling loose... otherwise find a machine shop that's competent enough to put bearings in for the balance shafts

over boosting a turbo justs mean less boosting life out of it.so if a 20g is running at or close to max safe limit say 90% at 17 psi thats close to 10k rpm right there safe.but take a 12a it will have to spin 3x that to build 20 psi and it will just be dieing with every boost a lil at a time .and boom.while motor may only be running at 5k that turbo is going buck wild spinning .or over boosting means stepping out side the safe rpm limit .it will for be fine for a bit. but every time u do u are just playing with a bomb.