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I've been searching for diffuser fins for my 2014. While I think the Stage 3 fins look great, they are comically large, so I've decided against them. Instead, I'm leaning towards a four-fin set. Do the reputable manufacturers, like ACS and EOS, place their mounting holes in the same locations? I'd hate to install a set now and later want to switch to a different brand because of paint quality or whatever. I really prefer not to drill into my car. Unfortunately, the EOS carbon flash fins are sold out everywhere, so I might have to reluctantly go with a set of ACS (price). I'm also curious if anyone has tried using 3M tape instead of drilling for installation. I imagine it would be pretty hard to line them up using tape as opposed to a drill template.
I went with the ACS fins. While more pricey than ones I see like on eBay, they are way much better made. I had them professionally installed since I don't want to go anywhere near my car with a drill!! LOL
I too went with ACS - IMO it's how the rear should have came from the factory. Really drew it in for me. I didn't want any gap between the fins and the bumper so I used the template drill method and seeded them up to the bumper. I never planned on swapping them out so it wasn't a concern.
I too went with ACS - IMO it's how the rear should have came from the factory. Really drew it in for me. I didn't want any gap between the fins and the bumper so I used the template drill method and seeded them up to the bumper. I never planned on swapping them out so it wasn't a concern.
ACS...not cheap but the paint match is perfect and they fit very well. I was able to do the install without removing anything from the car - it's a tight fit.
Thanks, guys. I am just going to go with ACS based on the comments. I tell myself ACS is too expensive yet I just replaced my headlights and tail lights with Morimoto. Lol
I did the EOS fins and found them of very good quality except they were mislabeled. The left was right and right was left. Install went very well though and the template was spot on. I used 1 inch fender washers to help spread out the bolt and over 1 year later, I have no gaps.
Another vote for ACS. Install tip, pick up some 1" washers to run the fasteners through. It gives you more surface area to tighten and pulls the fins in nicely
I started out with the EOS rear diffuser but then changed over to the rear diffuser made by a company called C7 Carbon. I like the look on the C7 Carbon rear diffuser more and it's a very well designed and made set up. I'm selling the EOS rear diffuser complete with template if anyone is interested.
I went with the EOS. 3D printed some TPU washers for the inside to take some stress off the holes I made in the plastic and be sure they could be good and tight without crushing anything or ever rattling loose. Looks like the car came this way as far as fit and finish. Easy job, little stressful drilling holes in the car and some of the bolts on the left require some patience. A wratcheting wrench is your friend here, especially a stubby
Looks awesome. 🔥🔥🔥👏🏾 I've been thinking of going that way also. I probably would go with ACS. The local premier Corvette shop where I live will not install any EOS parts. Only AOS and I don't want to drill on my rear bumper myself.
Looks awesome. 🔥🔥🔥👏🏾 I've been thinking of going that way also. I probably would go with ACS. The local premier Corvette shop where I live will not install any EOS parts. Only AOS and I don't want to drill on my rear bumper myself.
Thank You!
Last edited by Mike98SilVert; Jul 18, 2025 at 12:47 PM.
Rear diffuser fins
