Hey guys,

I was wondering if the 4 bolt pattern on my .63 ar gt30r turbine housing is the same bolt pattern on the .63 ar 4 bolt pattern on my 57 trim turbo? I want to run the gt30r but if I end up using the 57 trim, will I have to change the downpipe? They have the same diameter and same threads but I was wondering if the bolt pattern might be clocked differently?

 

as long as you dont have the "optional GT housing" then yes they should be the same.

 

This is the housing I bought.

http://www.atpturbo.com/mm5/merchant...egory_Code=GTH

It's not the one that is extended and tapered to 3" outlet.

 

That's correct. The housing that your 57 trim uses is a T31, as is the one you just ordered. You'll be fine for fitment.

 

Great. Thank u guys so much!