OP, start by cleaning your MAFs and throttle bodies, including the connections. Double check that you've installed the intakes correctly. If the code comes back without a corresponding misfire code of an individual cylinder, then start replacing parts.
P0300 is a huge pain in the ***. It's way too general, so it does no good as a DTC. My tuner ended up turning it off since my flywheel rattled enough for the ECU to think I was misfiring.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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