Keep hearing about this but not exactly 100% sure on what it does or the benefits/gains. Heard that a lil bottom end torque is lost but noticeable increase in the mid to high end power band. Do you need the nwp intake spacers before this? how hard is it do and who does this here? I think Bill has this done but who else ??? Any reviews/feedback is helpful,thanks_Sci

I didn't feel a loss in the trq, but autos seem to be more affected by it. Not much of a loss from what most say though. I think it is a worthwhile mod if you have the time. I did the ssim, VIAS plate and port and polished my UIM.

thanx for some insight on this but... i still dont really know what this does i think its has sumthin 2 do with cleanin the intake manifold for better airflow but i thought that was port and polish???am i even close wit that guess??? what are the plates actually blocking off??? what is vias and why do dudes wit the 3.5 motor often remove this??? thanx in advance Bill_Sci

There is a shelf inside the UIM. The VIAS has a door that opens when your car hits a certain RPM to let air flow into both parts of the UIM. By removing the VIAS and doing the SSIM (cutting out the shelf) it allows more air to flow and flow smoother.