Actually you get send a receipt (invoice) and they will honor the warranty, you just have make sure to use it. I made a mistake once while fitting a J&R driveshaft on a vauxhall vectra c. Longstory short the shockabsorber put a hole in the outer cv boot, fully my mistake, I called them up to order a new one got asked why as i just received a set, told the man what happened and they send out a replacement straight away, told me to send the one with the hole back with the delivery man. I put it back in the box got the other one the next day and handed the delivery man the old one. now that is what call service I didn't even have to pay for the replacement. It's one of the reasons why i keep going back to J&R. plus the fact you can get seriously strong versions if you go nuts and build a big BHP, high torque engine.