New to the forum (like 5 min new)
Iv got a 12 Chevy sonic 1.8 n/a I'm currently collecting part for a turbo build. My question is what #'s are the GT T25 .49/.48 known to make I got one cheep in good shape

 

Do you mean the Garrett TB25 (often deferred to as the "T25") ?
Well this TB25 is rated at a max. of 220-230 horses at the crank. But only if you have a very good setup

 

Need more info about the turbo to give you an answer.

 

It is the TB2566, from what I can find its off of a 97 eclipse.
With some polishing, exhaust housing porting is it worth using for a build?
Recently installed a header and down pipe, so far that's all the performance parts avaliable for my motor.
With that said it'll most likely become a mid or rear mounted turbo if I go through with it

 

I have the same turbo and Im wondering if it will be worth it as well, I called the dyno tuners near me (TD autowerks) and they said the turbo was trash not worth the dyno tune money or a hondata.