Well, I installed the Stillen air box yesterday. When you team this product up with the Crawford plenum and the Fujitsubo Y-pipe, it sure brings a big smile to your face when you put your toes prints in the throttle body. The engine just screams to life.

Let the good times roll........

 

so what kind of real gains are you getting? I ask because I've done Z-tube, K&N, and stock airbox mod, and the next step is either a crawford plenum or a 1/2" plenum spacer and i hear that plenum work really wakes up intake mods.

 

Click on "My G" in my signature for expected HP gains; I did not have any dyno done before or after any of these mods. Just forum research for other folks. I had the basic set-up you just mentioned with the Y-pipe. After installing the Crawford plenum and the Stillen box you notice a lot of extra acceleration