Bitdi cam chain questions

Jay81

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Iv just bought my first bitdi, the car is a 2014 with 100k on the clocks. My question is how long do the chains last, is it worth changing the top tensions as a precaution?
I love the car and want to keep it for the long term.
Side note, who is best to talk to about remapping these engines?
 
Really depends on how the car has been maintained. Does it rattle on start up?