Honestly could not answer that question as I purchased my Z with it already fitted, but know that the previous owner had fitted it under his ownership. He owned the car for 2 years and I've had the Z a few months.
Looking through service history, the previous owner didn't cover more than 10,000 miles. So worse case scenario, 2 years and a few months old and approx 12,000 miles covered. But could be a lot less...
Hope that answers your queries.
Thanks
hi
what is the db noise level?
thanks