As low as $35 / month using 
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Skunk2's 3.15" to 3.00" Reducer Coupler allows '06-'11 Civic Si, Subaru BRZ, Scion FRS, and Toyota FT86 Cold Air Intake system owners to install the Grams Performance & Design DBW Throttle Body without struggling to stretch the original coupler over the larger throttle body.