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Mo
The problem with the DF diffuser for $600 is that it is not functional, as I was told by SOS. The plastic diffuser that sells for around $1200 is more functional but they don't make it in carbon fiber
Totally lost as to what you're talking about here. Here's the deal:
There's a genuine type R diffuser that has some mild functionality at high speed when used in combination with the OEM exhaust whose heat shield becomes part of the aero.
There was a mode4 that was a replica of this.
There's a downforce sport, which comes in FRP or carbon, and it resembles the Type R.
There's a larger one made by downforce, available in both FRP and carbon that overs more functionality than the sport. It's also heavier, and it can scrape. Carbon and FRP don't like scraping. By the way the carbon is a carbon laid over FRP.
There's the difflow, which has the most proper shape and length, and is the most likely to be "functional", whatever that means... And since its metal it can really take some abuse.
None of these work that well without a sealed underbody. You need other and more parts. None work well when they sit too high off the ground. That means your car has to be low. Then even if they work, and are "functional", unless you're a really experienced track guy with suspension and tires, wings and experience to realize a difference, it won't matter.
The more "functional" aero stuff is made by affinity aero, Cody loveland's company, and that stuff is HUGE and probably way too radical for you.
If I was to buy another (and I've had several), I would buy the downforce sport because it's light, and looks good, and I would not worry about the function. It's function is that it doesn't weigh down the tail end of your car by 13 pounds. Or I would get the difflow and I would probably order it without the curved ends, add all the other underbody panels to go with it and make it fully functional. If I was racing I would buy Affinity Aero. You can get downforce directly from downforce, by emailing thomas. You don't need to go through a third party.