:smiledown: Nothing but issues with poor quality product.. I purchased drilled and slotted rotors along with their ceramic pads about 8 months ago, replaced factory equipment and after test ride noticed squeeling and a clicking sound from the rear axel. Contacted company and researched online, company states may be issue with axel or something else and could not be their product, removed rear rotors and pads, re installed old OEM and no sounds from rear, after further investigating, found that rotors were out of round and were catching parking assist pads on inside of drum. Contacted company and they replaced rotors (one time only) re-installed R1 rotors and pads and same issue, took off the garbage R1 rotors and pads and put on Carquest specials and all issues were resolved, but still stuck with defective rotors. Forward to about 3 weeks ago, squeels from front R1 drilled and slotted rotors, replaced pads and still squeels, replaced rotor that have only been on Nitro for 8 months and 10,000 miles, and squeel is again gone. Front rotors from R1 concepts failed after 8 months, poor quality product and manufacture will not stand behind product. BEWARE WHEN PURCHASING FROM R1 CONCEPTS.