VVT-i is a variable timing system used to squeeze more power out of fundamentally small engines. (You benefit, basically, from two different cam profiles.) You don't see many modified Toyotas because there's not as much interest in modifying them (and, arguably, not as many parts) as there is in modifying Hondas, Nissans, Fords, Chevys, etc. Toyota sedans have a very strong reputation to most as bulletproof high-quality-for-low-price econoboxes, and are typically priced outside the 'first car in highschool/college' price range (unlike Civics, Preludes, Sentras, etc) because of that higher build quality. Hence, the only cars you'll usually see work done on are Toyota's performance models to begin with.. The XRS for the Corolla is one example, or there's been the MR2s, the Supras, the Scion tC, the Corolla GTS...it all boils down to reputation of the brand, really. Do you see many people putting giant blown V8 monster engines into Ford's Econoline panel vans? Same thing.
(When you talk performance motors, you want to start talking engine codes, denoting the actual motor, not just a feature of the engine. Calling a vvt-i a performance motor is kind of like calling a car with A/C the luxury trim level. It's a little weird and a little misleading. For some help on engine codes,
http://www.geocities.com/MotorCity/P...ct/Engine.html is a pretty good place to start.)
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