[BlackRaptor]

Hey guys.
My truck is a full time trailer hauler. I use it to haul horse trailers for featherlight and trailswest.
this truck gets 12,000 miles a month put on it.
it's 100% stock right now and i really need to milk some more MPG out of it.
I"m just getting started doing this for a living so I don't have tons of cash to start out with. So i need to do this little by little.

I have a drop in K&N i put in yesterday because my paper one was clogged and i figured it will help a little.

I was looking at those true flow sealed air box cold air intakes. But i got to thinking do they really flow that much better then the OEM intake tubing?
because all they are is a drop in filter and new airbox to intake tubing.

Also I was thinking about cutting the muffler off. this will help millage right? and also lower my EGT's?

I pull double 24 + foot trailers the ones that are half camper half horse trailer through the rocky's all the time. this truck gets worked hard.

So for starters I was thinking. remove the muffler and go cat back straight and get a cold air like the true flow.

But the biggest thing is i don't wanna mess with reliability at all.
Any input would be awesome thanks guys.