idk, i took get on the throttle a whole lot. i usually draft while im on the freeway. also, i have custom tunes, not mail order tunes, but a tune made for my truck while on the dyno. i think that has a lot to do with it. i have had canned tunes, mail order tunes and now a dyno tune. the dyno tune is the best by far, even when just crusing around town. i also have a performance valve body, which doesnt allow any tranny cluch slippage. any slippage is wasted power for that brief moment. doesnt seem like much but with all the shifts the tranny makes in a trip, it adds up. i also drive about 65-70mph most of the time. and i do regular maintenance, oil changes, fuel filter, clean my tb, tranny fluid only has a couple thousand miles on it and my rear diff oil only has a few hundred miles on it. i also have UD pullies and efans so no parasitic drag there. other then that i dont know, i dont have any secrets or anything like that.
i just mounted it to the back of the cab. small screws poke through the cab to the outside but they arent noticable with the bed covering them. even tho they never leaked, when i pulled the bed off to do my body lift, i put a dab of rtv over the screws. but this was two years after the initial amp install
i say go for.
1. yes its worth it
2.not difficult at all. if you have big hands/arms itll be a little harder but no big deal
3.you need the crank puller as well as a fan clutch tool. you can rent them from autozone. its needed to get the fan clutch off of the water pump