when it originally blew the noise was pretty bad,all sorts of rattling but when i got it back it was smooth sounding and drove excellent for about 20 k's.its still silent in neutral until u accelerate and the turbo tries to spool and i got a warranty on the rebuild so i cant see them just polishing it up.i spoke to maximum performance they want the car but ive already been messed around (garage ordered wrong turbo twice,hence the rebuild) and its taken 7 weeks to get it back so im exploring all options before spending any more coin