What all should I be getting done while the cab is off, it cost too much to take it on in off for all my up grades?
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Unfortunately, you are correct, it is almost always cab off. Depending on where in the country you are, studs (if you mill the heads, magna flux, etc.) is going to cost around $3500 when you add all the gaskets, fluids, and labor (if you can't do it yourself). That doesn't include any other mod, but to do studs, you have to remove the intake manny, exhaust manny, up pipes, turbos, etc. so it is a good time to do several mods. What you really need to do is decide on your budget and goals. Six months ago, I would have told you that I think a studs and a 71 were all you need to worry about (an exhaust manny and up pipes along and ported intake manny are nice bonuses too), but right now, the 6.4 aftermarket is exploding with new products. There are so many great builds going on right now for DD/towing guys, the answer is not so clear. Capt Dong is taking the air approach and doing the batmos. DesielFreak23 is currently doing one of the most unique builds I have seen to date (both stock turbo batmos, 30% nozzles, cam, valvetrain upgrade, intake manny, exhaust manny, and up pipes). I know another guy who just completed the HP batmo, a 71 batmo, exhaust manny and up pipes, and a WG which seems to be a good build. He just completed it so he hasn't got the bugs worked out (high EBPs), but it he says it spools very quick (which I would expect with batmos). Make no mistake, I am very happy with my build (intake manny, Elite 71, 6.0 exh manny and up pipes) and I wouldn't hesitate to recommend it to anyone (with studs), but maybe we will find out a cam on a relatively mild build is worth it. Or maybe we will find bigger nozzles with basically stock fuel running a shorter PW is the way to go for HP/efficiency. In summary, I still am an advocate of air first since it keeps the EGTs down. I personally love my 71 and based on indirect evidence (comparing different builds on different trucks so it is not an apples to apples comparison), I think the Elite 71 is the way to go over the batmo. That being said, I acknowledge that the batmos may be equal or possibly better. I know of only one direct comparison on the same truck (performed at Rudy's) of the Elite 71 vs. the batmo 71. On that truck with that programming, the Elite 71 did do around 15 HP higher than the 71 batmo. Of course, IMO, peak HP doesn't tell everything if you tow/DD. To me, the flatter HP curve, lower EGTs, quick spool up, and good BP/EBP ratio (1:1) in all circumstances except at WOT in the higer RPMs where I can see 50 PSI boost and 70 EBP si why I like it. There is a good chance the batmos might spool a little faster than mine so that has to be considered. Obviously, I am not knocking batmos...for $400, they are very reasonably priced mod which do seem to help spool up and EGTs. In summary, especially if you are going to do studs, take your time and research what's out there and decide based on your budget/goals. With all the different products/builds out there right now, you shouldn't have any trouble making a powerful, reliable DD.