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Okay, there are really two engines for the 240SX, in all it's variations. There is the KA24 family, and the SR20 family. The most common in north america are the KA24DE engines, which are 2.4 liter, naturally aspirated DOHC 4 cylinders. There is an aftermarket for these engines, including turbo kits. They can make as much as 500hp...
The other choice is the SR20, usually the SR20DET, DOHC Turbo engine... these engines have reportedly made 800hp, but I've never seen it. Figures of 600 hp are not unheard of, but 400hp modified engines are more common. Lot's of power potential for a 2800-3000 lb car...
The nicest ones, IMO are the 89-93(?) 240SX hatchbacks, the S13(RS13 Europe, 180SX Japan). A full turbo conversion on the KA24DE would be $3K-6K, depending on hardware choices, and whether or not you do it yourself.
A SR20DET swap is similarly $4K-$8K, depending on who you pay, and how stock you keep the engine(tweak tweak 350hp oops)...
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