Im going to be buying a garrett 57trim t3/to4e turbo. I dont know if I should get a .48a/r housing or a .63 housing.

I have a b18c1 motor, going to run stock internals. Only want 270whp on stock internals. Plan on putting forged internals next spring.

 

the bigger one or the smaller one ?

 

get the bigger one if u plan on making more then 270 in the future with the same turbo

 

Get the 63 ar it's actually gonna say 42 & 63 ar one intake and ones exhaust so youll have both ar's on it, i had the 63 realistically they both are the same turbo so you can't go wrong just the 42 will spool slightly quicker, my 63 ar 57trim hit full spool at 35-4k and on 7psi on a bone stock ls motor i made 242hp and 226tq so 10-13 psi should put you right on the money