I am really unclear as to how the Dinan warranty works. I'm afraid of being caught between the dealership service dept. and the Dinan reps in the event of a serious problem. Kind of like having an aftermarket warranty.
I'm also unclear as to what Dinan's stance is on additional aftermarket equipment. For instance, say you have their tune and later install an aftermarket catless DP. In the unlikely event of turbo or engine failure, the dealer would probably pass the buck to Dinan. They would certainly start asking questions about what is or is not installed on the car. They might even ask the dealer to produce any and all stored fault codes for review. I'm thinking that they would spot the faults in a second and deny the claim. I might be wrong but I don't want to find out.