Re: ITB Conversion on 16 valve 4AGE There are lots of differant methods to go relating to this, which way you'd like is around you and your finances. The 5 valve head is Toyota's bonus to the 4AG once the 4AGZE went absent. With the additional valve and unbiased throttle https://josuepomjh.activablog.com/26501860/an-unbiased-view-of-4age-20v-turbo-engine-for-sale