Today one of my friends brought over a buddy of his who has been building up his custom Prelude. He wanted to do something different and not do forced induction. His goal was a normally aspirated 4 cyl with 400+hp. The work is impressive: custom paint, a totally beautiful fabricated header, built motor, etc. The car revs to over 10k rpms.
Here are some pics and a list of mods:
I think Max will get on here eventually and he can tell you more about it then.