If you mail in your PCM/ECM, priority will be given to you to ensure that you have as short of a down-time as possible. In most cases, we can have the PCM/ECM tuned and back in the mail within 1-2 business days.
Our preferred method of shipping is USPS Priority Mail which takes 2-3 days.
We've encountered thousands of vehicles that have had mechanical problems that were previously unknown to the customer. In most cases, the problem was minor and well within the computer's ability to adjust, however without correcting those problems, a performance tune may have caused the problem to become more prominent and would leave the customer with a less than optimal vehicle. In many cases, the cause of poor gas mileage can be revealed and corrected. There have even been cases where engine damage would have been possible had these issues not been corrected.