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for what it's worth, when i first bought my MR2 i did a little experiment where i connected a 2g dsm valve to the recirc pipe that connected pre-turbo and vented the greddy valve that was on the car when i bought it. the theory was that when the greddy valve opened, so did the dsm valve, letting unmetered air back into the system to compensate for what was blown off. it actually worked very well. i could shift at redline, blow off and it would drop back to a rock-solid idle. i never noticed any black soot on the rear bumper either (and i have a white car). i'm not saying it's the best solution, but it worked very well and only cost about $10 to implement.
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