2013 Regal GS ram air hood
If it isn't functional, then it really would just look tacky. A Ram Air hood usually serves a purpose of bringing air into the intake using the speed of the vehicle. If you just slap a fake plastic AutoZone hood scoop on your GS, it's going to look bad and everyone will know that it's fake. If you are going to do it, spend the extra money and have one made for your hood or buy an aftermarket hood (if they even make one). I don't believe they make much aftermarket products for newer Buicks.
No. What does it do? Nothing. What is it for? Nothing (because it does nothing). If the car is a sleeper with a stroked LQ4... sure, but only if it's functional. Even then it's not needed.
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