I'm in favor of the dual drilled t4 Inline Pro. The runners have a good design, but since the t3 flange is what - nearly .5" smaller? than the t4, there will be a big step down going into the a t3 turbine housing. Has anyone figured a way to correct this or does everyone just bolt it up and leave the mismatch, which defeats the purpose of going with that manifold?

 

Up. Anyone had such a combination?

 

I ran a T3 62-1 on the SS T4 manifold with no problems a while back. Made 367 @ 11psi too.

Give Inline a call and see what they say, they can give you all the info you need to know about it. I'll PM you the #.