BoilerAnimal

The people who have installed headers, did you have to alter the tune and void your warranty or can you install them without altering the stock tuning ?

Livinlife

SgtC6

If you add headers you typically have to turn off the rear O2 sensors or you will get an SES light. This would void warranty for hard part failure when they download tune and compare to stock. Some out of the box turners, such as Diablo, advertise the ability to return to stock without the dealer being able to detect.