They do have one year warranty but I had them a year before I even intalled then. I had plenum issues (waited for chrome one forever). I haven't had body kit painted yet hense the low mileage on injectors. Still they really shouldn't fail so soon. They did manage to find me a replacement but said they don't make "that style" phase 2 that they had sold me anymore. I was also told that Dworks were Jecs. Whatever. I'll run with that for now. Next time I'll go to a 740cc or something.