I have a .42.48 Turbo That someone changed the exhuast housing on to a .63.. So that make it a .42.63... do you guys think that there could be a problem with it? Its going onto a B18b1 motor... IT has no shaft play and spins freely

 

Nope, it will work perfectly, provided that they got the .63 housing from a T3 with the same wheel size/trim. Odds are that they did - at least for OEM garrett turbos, the "Stage 1" wheel is the most common, especially in those two aspect ratios.

I wouldn't worry about it.

 

find a .60 compressor to toss on it, you will be alot happier.

the .63 turbine is more ideal for the larger displacement of the 1.8L, it will be less restrictive, but that compressor is still a bit small.

 

if he changes the compressor hell have to change the wheel also