OP, im glad you brought this up because i have found myself in a similar situation on tuning an 06.
Dominic has been awesome on helping me understand as well,
i.e. my issue, or question pertains to a truck going from 125% up 200% overs. but for the sake of hijacking i will start a post.
-M
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07' Silver 2500 5.9 4x4 LWB
Goerend 48re-csp5/EFI- T&C Mild Cp3-F1 Apex 7.5 -S369sxe Amsoil
Coolant Bypass -Airdog-D&J- Hamilton 188/220 -AFE-ARP Opti-Lube
H-Town Off-Road
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