Ive never seen a tune go bad and the reason why is the configuration is burned to your vehicles computer and wont change.
Now you can change the airflow of the motor ( ie, add new intake, headers, cam, forced induction) , and your tune still wont change ( because its burned to the "hard drive" of your vehicles computer), but the targeted setting will be off.
Since aftermarket parts change airflow, the car maybe able to get by without additional re-tuning. Some parts change the airflow significantly and you have to go back in for a retune.
Some shops will tell you every time you change a part which addresses airflow, you HAVE to come back for a retune. That's very broad and not always true.
I don't recall a vehicle with bolt ons ( to include headers) having a failure. If you beat the hell out of your car, Something is going to fail tuned or not tuned. If you went to the track every weekend stock, or tuned with bolt ons, if a part is going to fail, its going to do it in either set up. You just had the bad luck of having that one weak part. Nothing to do with the tune.
If you move to heads and cam, and didn't build it properly and tuned it great, it will fail at some point.
I see to many shops like to build force induction and add on the edge boost. You get some mileage out of the 650-700 HP vehicle, then the bottom edge will failure and the shop gets to rebuilt and the client gets to pay $10K for a "stronger build proof motor" .
Last edited by Tampa Tuning; 11-13-2013 at 06:06 AM.