Originally Posted by DDTCM
You don't need a tune for a off road mid pipe. The only reason you tune with a off road is to shut off the CEL. As far as it voiding the warranty.....not sure. I'm sure you could throw the stock mid pipe back on when you take it in and play dumb.
Could have sworn more than one person has said the fact the 02 sensors are still on, since a tune doesn't shut off the CEL it shuts off the 02 sensors will cause the car to not run as well. I forgot which it either runs way to lean or way to rich because of the rear 02 sensors still being on.