qoute:deercelica[The biggest problem with the 1zz-fe is the head. It doesn't flow at all. Put a full P&P on the head by a professional shop w/ a flowbench to get those numbers up. Get cams w/ valves and valve springs. Those should be on the top of your list. After that, get high compression pistons, upgrade the connecting rods if you want, but with n/a there is no real reason too, those factory connecting rods will hold. Don't forget all the bolt-ons, underdrive pulleys, straight pipe exhaust ] from zz.series.com i urge tocau members to have a look at this site i understand this just forum talk