Motordyne intake manifold, or the GTR manifold conversion if it makes NA power. Swap the TPs or HFCs to long tube headers, or Z1 headers with DE test pipes. Other than that, you're pretty much done. A lightweight flywheel or pulley will free up some hp and you'll see it on the dyno, but they don't really "make" power. A set of gears won't make any more power, but they'll make your car noticeably faster.
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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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