Alight guys, here's the update on the RW Carbon Under Tray and Diffuser.
For the diffuser, I went ahead and took the tape off then use 3M Body Panel Adhesive to make it permanent. 3M VHB tape kept coming off after car washes and drove me nuts.
For the tray, RW Carbon's supplier uses non-zinc coated hardware so it started rusting. Other than that, I have 0 complaints about the product which is holding strong at speeds and strong wind gusts. I replaced the hardware with titanium bolts below and 304 SS nuts. I'm loving the look and the couple ounces of weight savings
Titanium bolts:
(22) M6 x 15mm
(2) M6x12mm
https://www.aliexpress.us/item/2251832460881302.html
(2) M6x25mm
https://www.aliexpress.us/item/3256804544484260.html
1 pack of M6 Serrated 304 SS Nuts:
https://www.amazon.com/dp/B071XHYWLW...roduct_details