Defueling
#21
#22
i would change it you have no idea how more power you will get back. i was diagnosing egr codes and i tested my vaccum pump. it wasnt pulling the amount of vaccum that it was speced for but it still operated the wastegate fine with not much black smoke. i put the vaccum pump back on and immediently it felt like a different truck. it had a lot better power throughout the rpms and it could chirp the tires from a standstill.