I think that the k31's spool better than the s400s, so thats a good choice for a single. But I think they are also more expensive. II has them in a few varieties http://www.industrialinjection.com/id49.htmldiesel_ram_man said:And K31 could work out pretty good too. Also known as a Aurora 5000. Similar to a s400, the s400 might be a little cheaper. I see them for abotu $600 usually. It'll take a while to spool though, better have a ton of fuel and RPM.
The s400 is good because it has a variety of choices for the compressor and turbine wheels allowing you to build it to your application. And its really cheap.smokn3500 said:so an s400 is my only option for 650-700hp?