That is what the compressor housing on my T60-1 Garrett says except my exhaust housing is a .81 A/R and yours is a .96 A/R (= bigger). My guess is it is a T4 P-trim T60-1 sold in STS kits. Does the compressor wheel have 6 fins? If so it is a GT67.

Looks like one of the original STS kits with the intake pipe that goes under the frame into the engine bay. They changed that piping shortly after and my kit from Nov 04 has the new piping. I have pushed mine to 12 psi. Think you might get more with a GT67.

 

ok all I had was a tape measure but the compressor inducer is 58mm and the exducer is 78mm which from my calculations is a trim of 55 I was unable to get the turbine side off but the inducer on that side is 64mm

 

The sts kit came off a yukon denali but he said it was the one that ran outside the frame. IDK. Im not gonna have it going under the truck im gonna have it next to the frame rail

 

looking at the compressor wheel measurements that looks like a 60-1 on a P Trim T4 back half like Mort said. It's definitely the earlier piping style (the pre 04 design) as well.

You might hit 12psi with it, but it's not going to be a "good" 12 psi in terms of compressor efficiency range. A GT67 would do ya much better.

 

12 is the high range Im probably going to be running 10 almost all the time. will that be ok for the turbo and will it have good power to 6000 rpm

 

Not much of a difference in compressor map speak between 12 and 10psi. A 60-1 will probably be efficient only to 7 or 8 psi.

Let me put it this way -- I run TWO of those turbos with a stage III back half and they are going to be done at 15psi or so.

For anything more than 7 psi, you need the GT67 or GT70. You can buy them from STS, and can often find them for sale as people upgrade.

 

I'll do that a little later too bad that turbos not big enough. guess Ill have to wait for the boost I want. How much HP do you think Ill be at at 7-8psi with my mods?

 

Do youi think I'll hit my goal of 450hp at the wheels?