Alright guys I just got me a Holset wh1c and was hoping to be able to use it on my FC, But I was wondering since it is off a Cummings motor what exhaust size should I run on the turbo. I have a 12cm housing and I still have to measure the inducer and exducer. Now if I'm shooting for 350-450 hp would this turbo be able to push that? I have only found comp maps for wh1e turbo which I know is similar to this one I have.

 

Im not sure exactly which turbo that is but it probly close to the HX35 or HX40 which is what I am running. 3inch exhaust would be big enough. Although 12cm hotside sounds really small, Mine is 19cm and works perfect on my stock ported engine.