okay thanks in advance....my question is a "stupid" one..does anyone know, when plumbing in a turbo or blower on a 320i with CIS does the air flow sensor go up stream or down stream of the the unit....simply put does it see pressure or is it on the suction side...if any one has the address for a web site that i could look at i would be willing to share any info i gain as my long term project progresses....also any pictures of completed projects would be helpful, so i can see how you worked out the piping and if you recomend using an intercooler...