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Installed the 5* 87 tow/performance tune with no other mods. Truck feels great. Good enough for me. I'm coming from a modded, 2009 CTS-V so it's really a waste of time for me to try and get more speed at the cost of drivability or comfort with this vehicle.
I know what you mean I traded in my 650 rwhp 09 cts-v for the ecoboost.