If it was done with an LN kit you might have a sticker with an LN serial number somewhere in the car. Mine was in the trunk. Sometimes in the door as well. Worth a check especially if you have no record of it. If you find one you can contact LN with the serial number and they should be able to tell you when it was done and possibly by who. In my case I had the DOF installed and found the sticker afterwards lol. But in the end it was done 5 years back so was technically "almost due" based on LNs warranty etc. at the time. and I was happy to do the DOF anyway.
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2003 Boxster S
2004 Carrera Cab
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