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Thanks. Had been looking at lower diffuser fins (since found out technically called "fences") since I got my 2014 C7. Did not like the wide look of some or the price. C7 Carbon recently introduced this diffuser with fins that I thought looked great as well. it's less expensive than one that add-on two sides with fins but more than simple fins. They are made from carbon fiber. Mine is painted crcon flash and you can get visible carbon fiber for an extra ~$100.) It requires removing the lower bumper section and drilling 3 holes each for the 4 "fences" that can be done without removing the whole rear bumper.
I added for looks but diffusers on F1 cars provide more than half the total downforce, over 800 pounds. This is a pic of those used on the C6R and C7R:
Stage 2 Spoiler
