if you change the internals on your H23 Turbo (which you will have to) as well as the ECU, fuel delivery, bla bla blah, the redline won't stay @ 6500. Of course it depends on the engine builder, but turbo'ing an H23 isn't just slappin on some tubes and a compressor. it's basically rebuilding the whole engine from the ground up. from block to head and everything in between.

if you look around on honda-tech.com someone was talking about an H23 VTEC hybrid...