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If it doesn't make your car faster it's not worth buying. BECAUSE WE ALL TRACK OUR CARS 100% OF THE TIME.
Old mustangs had fake food scoops and fake side scoops, but you can't exactly call that rice, can you? It's an asthetic mod made to sell the car. It make the car look better, without adding substantial construction costs to the car. Not everything is about shaving .0001 seconds of your lap time. :| I thin a CF diffuser is a good idea, although this one in particular looks a little funny. Can't put my finger on it.
Either way, very few parts are wind tunnel tested, as it's extremely expensive to rent out a wind tunnel. Just accept this part for what it is. It's about as functional as an air freshener. It makes the car more pleasant to the owner, and that's what i was meant to do.
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