[TRDatVT]

Originally Posted by THUNDERA

Left stock, the intake and air filter will obviously be a restriction - especially at high rpm. Notice that the TRD CAI is in place on the Sequoia...That should be proof enough that the stock intake does NOT flow enough air for the S/C kit...

This is not necessarily true... think of it this way... take two different straws (one from hardy's and one from mcdonalds). Sorry if this sounds stupid but its a good example and applies to SOME applications but shows the point well. Take the mcdonalds stray which is small, by about half... seal your lips around it and in hale. It provides steady somewhat controlled flow with SOME restriction. If you take the larger straw (hardy's for example) and do the same thing, you can't get a steady stream that feels controlled since you are moving less air than the orifice is made for. This can create inefficiency in the intake portion of the system.

As for a real world example, my supercharged 4runner actually dynoed better numbers with the stock airbox and a k/n drop in. Sometimes it also has to do with having the air source separated from the engine compartment that is full of hotter air. I cannot say for sure which one is better, but I would wait for numbers before I went spending 400 on the CAI if I didn't already have it... You'd be surprised...

Josh