SOHN adapter kit for Series II RX8?
 

Is there a SOHN oil adapter kit available for Series II RX8?
Is there away to modify it?

No, it’s a completely different design on every level than anything that ever came before it. There may be some way to modify it on a separate feed tank, but you’re completely on your figuring it out with a custom modification.

Same answer here - I've spent counteless hours looking into the piping, instrumentation, and wiring and it is to be a very difficult climb to do. I've given up and change my oil frequently instead.

On the S2 - Run a little premix, change the oil religiously. Gut the cat/run catless if you can (Mine doesn't even throw a catless CEL anymore, I maintain the ignition system religiously)

You'll be fine

I live in California, Will I pass smog tests if im doing pre-mix?

I pretty much always premixed and never had a problem with passing smog in the last 14 years.