guys relax.. the engine is optimised as it is, sure go ahead and try and lower lift but from what ive seen so far u guys are going to end up with alot of money spent and minimal results, as well as possible disasterous scenarios if any thing fails or blows.... the only mod which i have seen work well is supercharging VVTI engines, especially those sold as Celica GT in America, they have a 1ZZ i think..no lift, but plenty of decent turbo/supercharging kits for em.. turboing the 2ZZ (in celicas anyways, GTS in america) is one of those "gray" topics. People have done it, plenty of disaster stories, high maintenance, and no where near the reliability or sturdiness of conventional toyota engines (5SfE, 3SGTE etc)...the 2ZZ wasnt mean to run turbo, so doin so usually means alot of problems with heating, management etc.. this process also means using a new computers, and there are always dramas with replacing with aftermarket computers, apexi etc have been used on the 2ZZ but because the factory ECU has complex features and properties which arent accomodated by the aftermarket models ( TRD japan will not release information about its developed chip also!) people are getting oil and engine light failures etc as examples of some of the constant problems..not worth the hassle IMO supercharging is a great idea, come in to bring power down low, an then shut down and let Lift push the motor through the higher RPM. unfortunately its more complex than that, due to engine management and timing, making sure supercharger/lift is switched accurately...has been a little successfuly but expensive!