You can try disconnecting the battery, but I don't think that will reset the CEL. You need an OBD to clear that. It sounds a lot like a limp mode issue, but you should check for any leaks. The intake for example, could have a vaccum leak or a faulty MAF sensor.
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[09][MB][6-Spd MT][Touring][Stillen Gen III][K&N][Borla CBE][Evo-R]
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