Everything depends on how much boost you would like up to 9psi you can run using all stock parts on the car when running over 10-20 id suggest a performance fuel pump, high quality aftermarket exhaust, fuel managment system, turbo timer/boost controler, oil pressure gauge, boost gauge <-(thats obvious by this point though), Wehn running over 20 id say get a compleat engine rebuild with all forged internals and get a prot and polishing and if you got the extra cash a 3-way valve job turboing your car can run you from 2,000 all the way to 10,000 depending on your taste for parts brand names and ofcourse the boost part. Keep in mind running more than 20 on stock internals may work but will cause early detonation and cost you more to fix then doing it the right way in the first place.

Also Boost isnt for the "Fast and the Furious Wannabe" Its a very powerful wany to get horsepower and can also be very dangerous if not used correctly so be safe and have fun.

Hope i Helped anybody feel free to add if i missed a few things.

Jimmy