4~5 grand will get you a Greddy kit which will produce about 290whp. if you want to get an upgradeable kit, I suggest full race or inline which will cost around 10 grand when all is said and done.

 

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If you want to do something like that build your own. It will be a little cheaper and you can get the parts that you want. The only thing with that is you have to know what you are doing and every little piece that you need. The only Ebay turbo kit I would possibly trust is this one: http://cgi.ebay.com/ebaymotors/GODSPEED-HO...2QQcmdZViewItem because it comes with a legit turbo. The only thing you would need is engine management, injectors and fuel pump. But by the time you do all that you might as well get greddy.