I think the GT40's come with a divided (international?) T4 turbine housing (at least the journal bearing turbo's do)... from the pics on Garrett's website the exhaust housing looks to be on center (at least on the ballbearing models). That being the case if you jigged your kit for, say, a tangential undivided T4 housing wouldn't you just need to match the turbine trim of any of the GT40 turbo family and then be able to use it with your kit? I was told all T4 Tangential exhaust housings are the same when it comes to the position of the flanges with exception to turbine trim... not sure myself... why I ask

Bill

 

A T4 flange is all the same as far as the mounting point, but the turbines housing outlet where the DP conects can very, that is the point where the kit would not bolt up properly.
The Garrett I have I believe is a GT40 the exhuast housing has an extra long throat area coming off of it, roughly 3 more inches before the DP could bolt up. Still a Vband style just longer.

Rick

 

Rick,
I saw the extended outlet as well on Garrett's website... is your housing on center or tangential? I was also told that exhaust outlets in relation to inlet flange location are different from on center to tangential. I have also seen where some housings are modified... where the housing is jigged and the outlet welded in place. The housing I have (on loan) is like that... with its 3" band flange welded to the housing. I guess the materials used for casting these housings have come along way and welding is not an issue when done right...
Bill

 

I just bought the wife an 03 silverado EC 2wd, the previous owner already swapped a 6.0 into it (it was a 4.8 truck) i am probably going to be getting this kit asap being they told me they have them on the shelf, im probably going to get the 67 upgrade. It seems like a smokin deal to me, and im going to order it w/ a 60 lb hr injector upgrade. I have a feeling im going to need to "haul some stuff around" alot once its done

Oh, and someone asked about the difference in materials, i know when i was looking into this for my buick everyone concurred redular steel is more durable when it comes to heat, the only stainless that compares is 312 (maybe its 321) stainless, im not sure what the trick kit is made of, but i know my buick headers would have been 4 times the money compared to ceramic coated mild steel.