Turbo Question
 

I was talking with a friend and he has a BW 61 mm unit part #169417. The wheels measure 2.42 3.44 inducer 2.79 3.14 71mm exducer and it has a 1.15 ex housing. was wondering if I could just get a different turbine housing for it as I can get this brand new unit for under 400 from him. I know ar of 1.15 is huge

anyone?