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Message: [QUOTE="Morgan@Midwest Diesel & Auto, post: 1137228, member: 8143"] Ok, let me make this very clear. Any time you go from a stock 11-14 charger to any 2015 charger there is a big dead spot down low. That is not the turbo. That is the tuning. The 11-14 vane control is way off with a 2015. Can you drive it, yes. Will it be anything like your stock turbo, no. With tuning we change the tables to mimic a 2015. When that is done they spool as good as a new 2015. Which if anyone has any real seat time will tell you does not spool quite as fast as the tiny baby 11-14 turbo. But it's way better than even a 6.4 with stock chargers. The 61mm TowMax spools better than a stock 2015 charger. The StreetMax is a tadd lazier. Even with a 1410 pw race tune it was nearly impossible to make the StreetMax smoke. It is still a small turbo. On a 6.7 you are talking a 100 rpm difference at best over stock. So stock starts making boost at 1200 this makes at 1300. I could make 15 psi at less than 1500 rpm with the 64mm. I don't think spool is an issue. I'm picky, very picky about what I drive. You talking about slighty modified stock turbos. Not s400's... Spool is very very minimally affected. But to get best results vgt tuning to mimic a 2015 is a must for any. Has nothing to do with the compressor size of the turbo. I would make all my turbos StreetMax but I have the TowMax as a cheaper lower hp turbo just to give guys a nice alternative to the stock cast turbo. It's not really a driveability difference. It's a power and cost ratio more than anything. So please, understand I am not a "big power" guy. Don't ever say a non vgt is so great to drive. I would take a 64mm over an s300 any day of the week. I've done a lot of this testing to try to help you guys with real world scenarios. I have no issue sending my 80 year old grandfather out in my 2015 or my wife who knows nothing about trucks or how modified ones drive. I never turned it down. Never changed the tune. They drive so close to stock that it's not an issue. Just letting you know the real facts from someone who's not guessing. I know them both because I built them. I've drove them extensively. They are both good turbos. If you don't really care about max power but would be satisfied with a nice hp bump and the added reliability then go TowMax. But for the person that wants to run with hot tuned 6.4's I would say 100% you need a StreetMax and a bigger pump than a 2011-14 has. That's gonna get you 600hp 6.4 type power with a big tune. Sent from my iPhone using Tapatalk [/QUOTE]