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Message: [QUOTE="Charles, post: 182748, member: 103"] You can have drop in replacement spoolup and driveability with unlimited top end performance all in one. What about that DOESN'T scream daily driver? Compounds are [i]obviously[/i] the most capable system. Hence the fact that many diesel engines come this way from the factory now. Fwiw, I've been driving around with this [b]94mm[/b] first stage for some time now, and I've got to say, the spool is a total non-issue. I'm still of the notion that you CANNOT oversize the first stage on a 7.3L engine. Garrett only makes one turbo frame larger than the GT55 that I'm daily driving with response that would probably SHOCK most people. At part throttle I routinely spin at least a little bit on the 1-2 and lockup... This is with no smoke, no real sound from the truck and very low rpm shift points. When my electronics were super Fubared I still towed my trail truck (F-350 on 50" backhoe tires) 5 hours through the mountains of TN, over MontEagle and all with [b]700psi[/b] of ICP to work with... Try that with even a modestly sized single. Servicability of certain engine components is a chore compared to a truck running a single turbo in the valley. But on a DD.... you shouldn't be pulling the valvecovers anyway. Seriously. Passenger's side valvecover is the only thing that takes me more time. Honestly, it's ~30 minutes to get that valvecover off, and ~45 to have it back on vs say 5 minutes each way with a single in the valley. For a dd.... this should not sway your decision IMO. Now if you hang the charger all F'ed up.... then yes, it could make things miserable. Conversely, if you hang it really well, you can have it off and on in a third the time I can. The next set of compounds I do, both chargers will be next to the engine and the set will have a lift eye made onto them for a hoist to lift the entire charger setup out of the way with V-band releases everywhere. [/QUOTE]