It all depends on how much you are willing to spend. take the dx motor out. Put a b16(160hp) or a jdm b18c (180hp)in there then it will be pretty quick and not crazy fast. im sure everyone that reads this will agree that you should do this if you are looking for pretty quick. If you are looking for a little more put a h22 or k20. These 2 engines have way more torque than the others and more HP. From what i heard the k20 in a hatch is SICK!!! but expensive. Dont put an intake and exhaust on your d15 engine. It is affordable but you will notice nothing as far as quickness. Trust me been there done that