I was able to clamp mine down without any issues... just had to keep tightening it. The issues I do have with the SPM MAF adapter+RU-3530 combo are:
1) The MAF adapter ID is smaller than the MAF entrance by 5.4mm. If I get motivated, I'll hone it out, but was disappointed since there was so much hype about the SPM MAF adapter.
2) When the airfilter is all the way on the adapter, the adapter is sticking into the filter (blocking air flow, causing turbulence) by about 1/2". The 3530 just doesn't have that long of a flange. I'm going to remount it so the filter isn't all the way upto the MAF flange, but I'm sure it will be difficult since the filter "flange" is much larger than the MAF adapter OD.
In the past, I've seen many posts requesting the ID of the SPM MAF... and most people say not to worry and just get it. For the record... it's 78.6mm. The MAF entrance is 84mm, but is reduced to about 70mm at the sampling tube (haven't yet measured this part myself.. going off other posts). The MAF exit opens back up to 76.5mm.
These issues might not bug some people... I guess I'm just anal.
