30 foot moterhome towing a jeep. Most driving is out west. Lotes of hill's an mountains. 2018. E450. Some places first gear an barely 15mph can this help a little or a lot. I have k an n air filter an I get around 6mpg ( Roderick pulliam, 05/11/2021 )

It would help quite a bit. Obviously, if the grade is so steep that it requires a first gear at 15MPH, I'm not sure how much quicker you would be able to pull it with the tuning installed but likely it would not require 1st gear anymore.

I'm sorry, but i do not have my VIN # handy right now. i have a E-450 with the V10 that has good power at low end, but the top speed appears to be 63-65mph. the engine sounds like it is coming thru the doghouse at that speed. Even at 60mph, it is constantly downshifting even on flat ground from 4 to 2 gear and putting us thru the windshield. i just got the K&N air filter and it made no difference on performance. Th etuner is next. should i go directly to the headers and or exhaust now or wait and see what the tuner does for me? what is the torque gain on a 2011? your charts don't show that. also, what is the torque gain on the exhaust and header systems? Will these make the unit much louder? Thank you. ( James Fleischman, 04/26/2021 )

Hi James,

I would say just start with the tuner your coach falls under this listing 2006-Current 2v V10 Gains of 43 HP and 47 ft-lb Torque (E-Series) this will be a significant increase in power and also reduce downshifting. Headers are great, but the labor on install for that engine in a C-Class is huge! If you do decide you want more after the tune, and decide to install the headers then it is an easy change to the tune to accommodate for them.