Don't get me wrong, my comment was not a dig at you at the slightest, I was trying to use it as an example. If a customer came to us for a package to make XXX rwkw and we did all the work and it did not perform, I would feel it was on us to find out why and then take it from there. If there was a mechanical issue with the car, well that becomes the customers problem, but if there was something with the parts we supplied and fitted it becomes our problem with no added cost to the customer. When a customer comes in with a package they have done themselves and all we had to do was tune it, well if it does not perform it can start to get costly trying to find out where the issue lays.