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I have a 98 a4 with maggie at 5 psi, no stall but shift kit and 373 gears,, I can run with and beat some older vipers, depends on the driver,,,newer higher hp ones are hard to whip one...but you will have more hp than me,, so you might be luckier
I would recommend at least adding a cam that can better maximize the additonal air from the SC. It would not have to be anything radical as even the smaller cams respond well to SC. However with that said, the only thing I would be sure to get is a split duration cam with the intake side that has a lower numerical value than the exhaust side.