Here is my $0.02
After reading and talking with Subaru guys and several different tuners this is how I did it:
In order,
STi top mount (with mishimoto silicone kit)
Catless up-pipe
Turbo-XS down pipe fitted to an STi cat back
GrimmSpeed manual boost controller
Tactrix cable
At this point I got an e-tune with the stock turbo. With these simple easy mods and a good tune WHAT A DIFFERENCE! I eventually swapped the STi cat back for a 3" Borla Hush.
I am now in the process of upgrading to a VF48, AVO single piece turbo inlet, DW 255 fuel pump and possibly injectors. But, my car has 160k on it and still pulls like a wild animal.
After reading and talking with Subaru guys and several different tuners this is how I did it:
In order,
STi top mount (with mishimoto silicone kit)
Catless up-pipe
Turbo-XS down pipe fitted to an STi cat back
GrimmSpeed manual boost controller
Tactrix cable
At this point I got an e-tune with the stock turbo. With these simple easy mods and a good tune WHAT A DIFFERENCE! I eventually swapped the STi cat back for a 3" Borla Hush.
I am now in the process of upgrading to a VF48, AVO single piece turbo inlet, DW 255 fuel pump and possibly injectors. But, my car has 160k on it and still pulls like a wild animal.