Friend has a 740cc fuel injected kohler. It now runs on E85 and has a far too large turbo (meant for a motorcycle) making 3psi. A smaller turbo is coming soon which it should be able to actually spool and make 15psi or thereabouts. Also, a 2003 S600 V12 biturbo with exhaust cutouts.
I was at WOT in this video and I might as well have been in park.