Seafoam 4g63 T

Any one ever try seafoam before. I bought a spay can, can some one point out on the pix, 1 or 2 ( I want to know which hole that I can spay this thing in ) thanks

http://img140.imageshack.us/img140/8378/seafoam3xx.jpg (http://imageshack.us)

I spay alot today, and I never see smoke ? not even tiny little smoke come out of my pipe, what the hell is going one, my intake really that clean ?