I've got a CSF and it's been great. Fits with stock fans, etc. GTM's got one but it's fairly pricey and I believe you might have to use their fans. The CSF was $600-$650 or so, but it's not really a DIY since you have to evacuate/recharge the AC system when you install it since the radiator is attached to the AC condensor. You may be ok without one since it's a SC setup. My turbos are oil and water cooled, so they ask a lot more of the cooling system. It won't ever hurt to add a radiator. If I were in your shoes, I'd hold off and see if temps are ok at the hottest part of the summer up there.
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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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