so you are going to do the same thing here as you did to the RAV4

Is there any factory holes in the front core support of the GK so you can still maintain bigger and bigger diameters?

Yes! Eventually, I'd like to have the diameter getting wider away from the maf sensor (or smaller as it approaches it) but not smaller than the maf sensor diameter itself.

Once you remove the stock battery and it's support, there is a small hole that leads down to the driver's side fog light area. You'd have to either relocate the battery or get a smaller one so it doesn't block the piping that goes through the hole. Can't say how large a pipe would fit through it though....yet.

i wanna see pics so bad ....