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Message: [QUOTE="Big Bore, post: 55961, member: 760"] Here is my current thought's on this. 38r drop in for a entry level. Then once you get the horsepower bug bad, why change that turbo out? As soon as you start going up in size with that single, you are going to begin having DD/towing issues. Especially if you live at altitude or tow heavy. Assuming your horsepower solution uses all the other required upgrades to get you over 500 safely, why not leave that 38r, gate the shyt out of it, put an atmosphere charger in front of it, and you don't have to worry about the spooling and high egt towing issues, because you are still using a 38r to spool, but you have the atmosphere kicking in and doing the work on top. It can be gated to suit your HP goals/abilities, then stepped up when you want to go bigger. Just look at what the 6.4 is doing. Guys are running 12's with a DD tow rig that can tow heavy with no penalties. Seems like doing the larger single and expecting to still be able to use your truck for it's original purpose is an exercise in futility. I think what Charles has been doing is a perfect example. Mike O (Blowby) is running massive injectors on a set of compounds that are jokingly referred to as towing compounds by the builder and he can pass emissions on a over 500HP tune, but layed down over 1000HP with some Nitrous, and I watched him run in the high 11's on fuel. In Denver. He does DD it, and if it had a hitch I have no doubt it would tow fine after talking to him a few times about turbos. I'm not saying his setup is typical at all, but with a bit smaller setup a guy could have a serious ground pounding truck with good DD tow manners. Another guy just did a dyno run using a stock turbo as his primary. So why not put a van housing on it with a big wastegate (lot cheaper than a turbo swap), then use money saved to buy a JB 4202 atmo and some 250/200's and own the street. The stocker turbo will be back to working at stock levels so it worrying about overboost won't be an issue. I'm seriously beginning to think using a big single on a DD is getting to be passe'. [/QUOTE]