I currently have a HEY351CW over an S400. I'll be running Flux 1.8's within the next few months and would like to change out the top turbo shortly after.

So...

What would you recommend and why?

 

I'll have that turbo set up on my truck in the next two weeks and have 1.8s. I can give you some feedback on that set up then. Nathan says they will support 650hp. You might not need to upgrade the stocker. If you do, a 62/65/13 would be a great choice, but I think to exceed 650hp you will also need to step up the s400 compressor wheel to an 80mm.

 

It needs to tow reliably, so thats something to consider also. I'd be curious to find out what my drive pressure is with this setup. Everything is cool now, was just wondering where I'd stand with the larger sticks.

 

Also, my top isnt a stocker. Well, not a stocker for this truck. Mine went bang in a big way. lol

 

Oh yeah. Well, it's a stocker for me. Anyway, Nathan seems to think drive pressures will be fine. I will let you know as soon as I get them installed and do some testing. I'm hoping I can do the install next weekend.