Hey you Nismo guys.......Help me come over to the DARK SIDE!

I have been Honda/Acura for years and I'm thinking about going RWD now.

I am looking into buying my first 240 but I don't know enuff about them to make an informed decision. I tried looking around but I couldnt find all the info in one place.

What model years are more popular than others and why??

What is the differences in S13, S14, etc. etc....what do they mean? Are certain s13 things good or bad as well as s14s?

I see engines that are red tops and black tops...what is the diff?

I see different engines ...SR this and that...is there a difference like Hondas are VTEC or not? Difference in torque like B16, B17, B18, etc?

I see some engines are DET and others aren't...?

And finally, What the hell is a kouki???

Thanks for your posts and assistance.