Fun facts... the gt45 and 7875 are very simular in size externally. I was actually worried i got too small of a turbo for the 6.0L, but then i checked out the internals and they are very different. the turbine outlet is much bigger on the VSR, it came with the 1.27AR and 4" coupler or what ever the bigger size is off the gen 2.5 billet