I did a search and didnt find any good answer so Im gonna ask you guys. I have a T3 turbo off a saab. .48a/r 42trim. Im new to the turbo game and was wonder what size T4 trim should I get. Does both wheels have to be changed to upgrade it to a T3T4? I like the .48a/r. It will make it spool fast and have alot of torque early i think. but i not sure. Where can I get it built it built for resonsable price.

 

you can try cheapturbo.com, im not sure if they upgrade, but they have good prices on turbos