Ive been running the regular tune on my Titan for a year, last week i switched it to the premium tune, ive noticed going up hill seems to be smoother and the exhaust isnt as loud like it's not pulling as hard. also with the regular tune my tranny kinda acts weird around 40mph until it changes gears, driving at exactly 40ph makes the truck run kinda sluggish unless you give it enough gas to switch gears. so now with me running the premium tune the transition through 40ph is smoother with more power.
Why does my truck run like that without the premium tune? what is the premium tune changing that makes my truck run like it should?
im kinda puzzled on this. also with no tune at all, the truck runs sluggish as well.