Or you could go the engine-swap route...for Toyotas, Hondas, Mitsubishis and Nissans, this is a very common option. It's not uncommon to see Toyota engines swapped into Daihatsus either (Toyota basically owns Daihatsu anyway).
By far, Toyota seems to have the advantage in terms of cheap engine swaps. Honda engine swaps are usually pricier like-for-like.
The beauty of engine swaps is, depending on the engine, they may already have high-RPM/high-compression NA characteristics or some sort of forced induction (turbo or supercharging) already included. A lot of 1980s and 1990s cars also have some provision for an engine swap already.
High-revving NA engines commonly swapped in are the following:
Honda B16A, K20A, B18C, H22A, D15B
Toyota 4A-GE 20-valve "black top"
Nissan SR16VE (rare AFAIK)
Mazda B6/-ZE (seen this installed in a Kia Pride)
Mitsubishi 4G92-MIVEC
Forced-induction engines commonly swapped in are the following:
Mitsubishi 4G63T
Toyota 4E-FTE, 3S-GTE, 1JZ-GTE, 2JZ-GTE (all turbo), 4A-GZE (supercharged)
Nissan SR20DET, RB26DETT
Correct me if I'm wrong
Last edited by Type 100; February 17th, 2010 at 12:05 PM.