Where in relation to the air mass sensor did you mount the SIR? I attached mine to the stock rubber elbow that came off the throttle body, then mounted the Air Mass Sensor in front of that and then attached an ITG air filter to the front of the Air Mass Sensor. It's a tight squeeze but it fits.
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Thanks for the information; that's the same configuration I was planning to use. If I might ask, did you have to make fuel pressure or programming adjustments to make the configuration work? I heard from a very reputable engine builder that stock software will work (down a few horsepower, granted, but run safely) in that configuration but that seems to conflict with what I've heard about dangerously lean conditions requiring substantial extra fuel to achieve safe AFR.

tom
(not an engineer, can't play one on TV, nowhere near a Holiday Inn Express...)