I purchased a catalytic convertor from Eastern Catalytic via RockAuto. It was the first product I ever bought from RockAuto's website. This item failed after 3 months of use. It was advertised to last either 5 years or 50,000 miles. Eastern Catalytic claimed that I was responsible for the failure because the exhaust leaving the engine is allegedly overheated, thereby burning the converter. However, I am certain Eastern Catalytic doesn't supply/make quality products, which subsequently, reflects poorly on RockAuto, since they promote EC to their customers. Although, I am not an automotive expert; I am certain the quality is poor because it is improbable that my vehicle is the cause of the failure if my original OEM converter, which worked well for 10+ years, did not fail due to overheating/burning. It simply became less efficient over years of use. I still have it and the the internal structure is totally intact.
Bottomline, I didn't get a refund from EC, and RockAuto didn't try to meet me half-way to keep a new customer. I lost $300. Stay away from RockAuto. They don't care about their customers.