ok I'm a newb to bmw's and to boost, and now I'm trying to put the 2 together. ok, first off, what will I have to do to the computer to tune it? I'm sure to a degree the MAF will compensate for the increased airflow, but would it be safe to run it on the boosted side, or should it go on the inlet side? also I know that timing will be affected by adding boost, so what would be done to compensate? is there a chip/programmer available to make the necessary changes? are there any significant changes in fue mileage? will it mess with any of the factory electronics and metering systems? I already have to pull the head to regring and resurface the valves, so what, if any, internal mods should I need to do? should I go with a different type of head gasket? higher strength head bolts? also how much boost will the stock internals handle? or, how much spray could I safely run without boost? what would I need for that? if anyone knows any of this it would be great, or a link to where i can find this stuff it would be much appreciated. just trying to decide my best option at this point. I mean, I already have to put money and work into it, might as well do something nice with it while I'm at it