[jbrew]

Depends on who's tuning and what hardware you've installed on the truck. A stock exhaust would be better than 40's as far as putting your torque down low in the power band where you need it. Flowmasters are torque eaters, but they sound good. Flowmaster makes a 44, I don't know about it's constuction, but it may be better than the 40's.. It depends on what your really after- performance or sound, you can have both. I can tell you right now that your max torque is up high where you don't use it unless you drive around @ WOT everywhere you go...

Power at the rear wheels is hurting, just from the 40's - That's an easy fix tho (change them) - A good tuner might be able to tune your torque lower , but it will be a b^tch with the 40's... -That's what Dyno's are for .. 4.10's will definitly offset torque giving you more at the rear wheels. What I'm saying is, you could do allot better with a well thought out exhaust system.