Originally Posted by MotorWest-Perf.

I know this was posted a while back, but I did want to answer your question, thanks for asking!

The Denso upgrade set we offer is far more reliable in the long run, IF you're going with refurbished injectors (obviously new would be ideal were it not for the insane price of genuine Toyota units). Without going too much into detail, the OEM brown injectors fail at much higher rate than your average injector (this is why you see so many misfire issues in this platform with the 3.4L). The electrical component degrades over time and the injectors die eventually. The issue is there is no way of predicting when that will happen. So if you purchase a set of refurbished brown units, it's quite possible to have one die soon after as you have no idea how many miles are on each of those. The Denso replacements we offer don't have that electrical issue at all. In fact, in the thousands we've refurbished, that's never been an issue, not a single dead injector.

If you still need more clarification, please let us know.

As for the 12 hole units, I'd be careful about running those, they were not designed for the 3.4L intake design.