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Originally Posted by Gekko
This going to sound a bit strange. Domestic cars better to tune because the engines has allot of unused potential. Tolerances are also bigger on domestic engines because they are most of the time low-tech compered to Japanese designed engines. Tuners don't like high-tech complex engines because it takes a lot more time (and money) to develop and test a performance-kit. And most of the times these performance-kits are not healty for the lifespan of your engine.
Even performance-kits offered by Toyota themself (TRD & TTE) are not 100%. A friend had a Toyota Yaris with a compressor kit from TTE and the engine died with a loud bang (pistonrod left the engineblock). Squising another 10HP out of an Toyota engine and give it a lifespan more then another 10k is hard en expensive. Only a hand full of Toyota engines are good for tuning (4A-G(Z)E, 3S-G(T)E, 1JZ-G(T)E, 2JZ-G(T)E, 1G-G(T/Z)E.
Because the domestic marktet still uses big strong (iron-block) engines, it is no problem to strap an aftermarket compressor or turbocharger on it. They can handle it. But a Japanes engines with low-tolerances will break if you try that. You have to change the pistonrods, crankshaft, valves etc to prevent the engine to break down very fast.
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Uuuummmm have you heard of the LS1? Look at Honda 4 cyl engines( those things get moded out the wazoo).
