How do I tell if I need to replace my rotors? What do I look for? Any advice is appreciated. Thanks guys!

 

I would check your specs. Normally on the back of the rotor or do a search and I bet many posts have been made on this topic.
Also, check for any cracking between the holes in the rotors. If they look like they have a lip on them I would think really hard on replacing them. Thicker rotors = better braking or at least less warping of the rotors.
Check Pelican Parts and Suncoast for pricing.
For as fast as we can go in these cars you need really good brakes. No excuses.

 

To really determine if they need to be changed, you need a micrometer to measure the thickness. The spec carsareart mentions is the min thickness to be OK. Otherwise, you can just change them due to cracks, lips, age, or just because.