Well, you begin at your engine. However, if you wish to do this, it will take a lot of money, so I hope you're loaded. I would recommend either a JDM H22a (From newer Preludes or some JDM Accords) or JDM B18c5 (From Integra Type R). Replace all the internals including putting in low-compression pistons, and don't go cheap on this. Buy a racing head, performance headers (get the 4 into 1 headers if you can), replace the exhaust with NO BIGGER THAN 2.5", replace all suspension including sway bars and adding strut bars (and don't get the cheap ones from ebay), get a nice intake and put a K&N or AEM filter on it, get a racing clutch, heavy duty flywheel, put in disc brakes, racing brake pads, steel-braided brake line. Oh almost forgot a turbo from Turbonetics or Greddy or somewhere reputable, cheap ones won't work for long.And all of this is just for starters.