The L5P's stock setup leads to a ton of soot buildup on the MAP sensor over time. This requires constant cleaning. S&B's MAP Sensor Spacer, once installed, significatly decreases the amount of soot buildup so you have one less thing to worry about.
The amount of soot that builds up on the L5P MAP sensor is unreal. Checkout out the photos in the gallery to see the difference their MAP Sensor Spacer kit can make on your 2017-2019 Duramax.