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For Aero parts, I would look at C7Carbon.com. All my carbon fiber parts are from them and I couldn’t be happier with the quality, appearance, and performance.
For performance, I would use LGMotorsports or AFEPower.com. They own PFADT racing now, and I love their stuff.
It really comes down to your budget. When you say cosmetic and performance, that has a big range of prices. I would look at the Vendor Directory under the marketplace at the top of the page. Look through them and then ask about them. I can tell you one to stay away from and that is Corvette Mods.
I like APR for the aero. Not cheap, but excellent quality. I'm using APR to replace my RPI splitter that I destroyed on my driveway over the weekend. Never a dull moment.
Thank you those who replied, I don’t have much of a budget but I’m mainly looking for quality parts & I do understand that you have to pay for great quality.