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designed for the 2011-2012 model
if you have a A4 base model check out this product
This allows for smoother air flow below the front bumper
Complete the look of your rear diffuser on your BMW M3 or M4 with our pre-preg carbon fibre diffuser trim
Upgrade your AUDI R8's engine bay with our PRE-PREG CARBON FIBER ENGINE X BRACE
Scion FR-S/ Toyota GT86/ Subaru BRZ Rear Bumper Valance 2013-2016 F82 M4 designed for the 2011-2012 modelDiffusers work in conjunction with other aerodynamic components of a car to help produce downforce. Because a car displaces air as it moves forward, the air molecules in the rear of the car get disrupted causing a vacuum of low pressure air. To help channel the high speed air flow coming from underneath the car, diffusers redirects the high speed air flow to transition smoothly transition into the low pressure vacuum in the rear. This encourages a
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