The power gains go the FI by a hair, but all exhausts will be within striking distance of each other. Drone seems to be more dependent on what you do with the stock cats, if anything. The only negative thing I've ever heard anyone say about FI is the waiting list, but that's what happens when you have the most popular product.
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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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