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Message: [QUOTE="WhiteMamba_Scorpion, post: 1480735, member: 13725"] IMHO... comparing spool up to stock. If you're looking for a "stock" spool up = VGT or a max 64mm non VGT. If you're looking for a "street" truck that maybe tows a trailer a couple times a year = VGT or 66-72mm non VGT. If you're looking for a "race" truck = 72mm+ Non VGT single or go VGT with compounds/triples etc... *Does not take into consideration the people who don't mind towing with huge singles and smoke shows on every hill. Now that's a VERY general list because there's a million different opinions and mods/combos you could do and yes you could tow with a 76mm single but I doubt you're setting cruise at 70mph pulling a camper up a 6% grade without it smoking. I will say from experience my 64mm non VGT spooled a tincy wincy bit slower than stock with a built motor and fuel but held boost great pulling grades and overall it was very hard to get the truck under the turbo and smoke. Anything bigger than that 64mm non-vgt does not spool like stock... but you can still make it run smoke free once you learn how to drive it. Now that I'm on 68mm non-VGT it spools just a hair slower than the 64mm and again slower than stock... but like mentioned before I can set the cruise on a grade no problem as long as i lock out 6th gear. 6th gear on a long steep grade it will start to come under the turbo and smoke. I've learned how to drive it and can drive it smoke free but when I want to light it fast I use the tap shifter. Just flooring it and letting it downshift itself it will smoke until it spools in a second or so. It is not the instant on like the stock/64mm non-VGT was. But I'm also making 100 more hp. Take it as a grain of salt but that is my personal experience. I've only had non-VGT aftermarket setups but if I were to do it again I wouldn't hesitate to do a 6670 VGT or a non-VGT again. [/QUOTE]