I think you need to up your goal. The guys with the Fast Intentions kits are running 600whp+ on stock blocks. You've got the motor to shoot for higher.
Not to mention 600 on the stock block just screams "borrowed time" to me.
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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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