The engine is a stock 6.0l with a ls2 cam, 317 heads worked over. I went through tnetics and ask them to build a turbo for my app and I was looking for 1000hp. At first they set me up with a billet wheel 76mm, that was this spring in march, the billet wheels were on back order for a couple of weeks. To make a long story short it was 4 months later and still waiting for it, I settled for what I have now, they said they would custom build a 78mm standard wheel turbo that should make close to 1000hp. IDK exactly what the exducer of the compressor or the inducer of the turbine is. I guess if it dosent meet my expectations it will be for sale and I will go with a garret or something, I was a little disapointed in the whole Tnetics waiting game.