Honestly, if you are worried about longevity, you gotta be careful with the cheaper kits. I have seen some really nasty yellowing on the budget stuff after just one summer in the sun. If you want that factory look without the factory price tag, I would compare two main options. The Racing Sport Concepts CT5-V Blackwing Carbon Fiber Rear Spoiler is basically the gold standard for aftermarket fitment. It is pricey, but the weave is perfect and the UV protection is top-tier. On the other hand, something like the Extreme Online Store CT5-V Blackwing Carbon Fiber Front Splitter is way more affordable. It looks decent, but the clear coat is thinner and the fitment might require some massaging during the install. My best advice is to get any carbon piece ceramic coated immediately to prevent that peeling you mentioned. Also, be careful with those low splitters... it is way too easy to crack them on a steep driveway if you are not paying attention.

Congrats on the pickup! Summit White is such a clean base but yeah, it definitely needs some carbon to pop. Tbh, I've seen a few guys go with the Savage Cadillac CT5-V Blackwing Carbon Fiber Aero Kit and it looks killer for the price, but you gotta be careful with the fitment during install. If you're worried about the clear coat yellowing long-term, I'd personally spend the extra cash on the Anderson Composites CT5-V Blackwing Carbon Fiber Front Splitter. Their finish is way closer to OEM quality and the weave is super tight. Also, if you wanna fix that tucked wheel look without buying new rims yet, just grab some Paragon Performance 15mm Wheel Spacers. It gives it a much meaner stance immediately without ruining the ride quality. Welcome to the club!

Welcome! Quick question tho, are you planning to track the car? Honestly, you should just check out Renick Performance Carbon for their aero, they really know these cars inside out.

I saw this earlier but just getting around to it now. Honestly, I went down this exact rabbit hole with my own Blackwing last year and it can be a total headache trying to figure out who actually makes quality stuff versus just dropshipping cheap molds. I was super paranoid about the clear coat too since mine sits outside occasionally. I eventually landed on the Weapon-X Motorsports CT5-V Blackwing Carbon Fiber Aero Kit and the fitment was actually spot on. Weapon-X has been in the GM tuning scene for a long time, so they really understand the mounting points on these cars. To solve that yellowing issue you are worried about, I actually had my detailer wrap the carbon pieces in PPF and ceramic coat them before they even went on the car. Tbh, that is the only way to really guarantee it looks fresh in five years. For the stance, if you want to skip spacers and go for a more custom look, I would look at the Vossen HF-5 Hybrid Forged 20 inch Wheels. I went with a slightly more aggressive offset than stock and it completely changed the side profile. It makes the Summit White look way more like a proper super-sedan and less like a standard Caddy. Just a heads up tho, if you do go with a bigger rear spoiler, make sure it is high-quality carbon because the drag at high speeds can actually stress the trunk lid if the mounting isnt solid. Good luck with the build, the LT4 is an absolute beast once you get the look to match the power!

Congrats on the Blackwing! That LT4 is a masterpiece, but I totally get the sleeper vibes. Since you're worried about clear coat failure, you really need to look into the resin manufacturing process. Most yellowing happens because of cheap polyester resins instead of high-temp epoxy. Honestly, for the best stance without messing up your suspension geometry or scrub radius, check out HRE FlowForm FF11 20-inch Wheels. They fit perfectly and clear those massive Brembos with zero issues. For the aero, I'd suggest looking at the Carbon Fiber 55 CT5-V Blackwing Front Splitter. They use a pre-preg vacuum-bagged process which is way more stable than the wet layups used by budget brands. Just make sure to wrap any carbon in XPEL Ultimate Plus Paint Protection Film immediately to block UV rays. Its basically the only way to ensure the resin dont yellow over time.