With the 2nd Gens, it was right around 400rwhp that relaibility started to become an issue. I feel that it's around 450RWHP on the 3rd gens when stuff starts breaking when using all the power all the time.
Can the truck still be daily driven? OF COURSE, and it's alot more fun, and might even get better mileage if you keep your foot out of it, but, when do parts start breaking after extended use? I feel the magic number is ballparking 450rwhp.
My truck, at 516/1022 is a GREAT daily driver. Get's an honest to goodness 20MPG at anything below 68MPH (empty), and is wayy to fun to drive, but, on occassion, I will pop a u-joint, blow up the differential, snap an input shaft, break a clutch, or transmission, or break the engine.
Is it fun? Yes, Is it Daily Driven, absolutely,, I have 60,000 miles on the curent setup. Is it reliable? I wouldn't say so. It's at a shop right now getting the 6-speed rebuilt, and a new clutch. The break before that, it was getting new u-joints (only 5k on the last set and the burned up with too much towing)
That's my take.
Merrick