Since there is a line feed to the turbo, i don't see why or how you would change it, until u change your motor oil. Sometimes the oil seal breaks/faulty in the turbo (happend with my friends evo) and you will smell the oil burning through your hvac vents.
as long as your setup isn't doing this
YouTube - True Compressor Surge
YouTube - Compressor Surge - Grand National
or if your getting flutter dump, and runs properly then i wouldn't worry to much. As far as the flames go, its most likely due to the meth/catless/fuel mixture (my friends gt35r evo spits flames all the time). Maybe someone else will chime in since i only know very little about turbo's
btw i am really jealous, i want turbo and flames
