i had the same thing, dip to 500 then stumble and back up to 650ish - had the Stillen G3 too. it was one of the fresh air feeds for the crank case ventilation system. I cant remember which side of the Stillen piping though, but if you have digital calipers measure the inside diameter of both fresh air feeds and you'll find one is smaller than the other.
The fix is to saw the small one off, enlarge the hole to suit and weld a new bung with the correct inner diameter onto it. You will need to really wrestle the hose over the new bung though - for some silly reason stillen didnt give reinforced hoses for the ventilation system so they will tear if you aren't careful.
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