talk to afterdark about buying a refurbished ka motor ready for turbo with redone internals, injectors and whatnot. u might end up spending more than 8K, after brakes/suspension (which would be a nice thing to have if you plan on putting 300+ under the hood =)
http://www.nissaninfiniticlub....=2794
take a look at that thread, there is also this link which has a list of everything he has put in his car (dont forget to look at those numbers =)
http://www.nissaninfiniticlub....shtml
a turbo kit, you have probably seen this
http://www.i-m-racing.com/xs9324turkit.html