Reviewing the Stealth Module I had on my 2020 L5P Duramax. After tuning and deleting mine, I no longer need this module so I wanted to see if my friend Matt can notice the difference on this Duramax. Keep in mind, his truck is on 7-9" lift and on 40s. It's a big truck and any added power will help! Hoping to see if this module can unleash the power of these trucks!