i would agree with most these guys saying you will get around a 14.5. with the 295 tires you should def be able to hook up those are some beefy tires are you running them on the front to?
p.s do you got a sound clip of your exhaust you have a pretty interesting setup, i havent heard a no cat mid muff system on the 4.0
2005 v6-14.8 1/4
Performance Mods~Mac Dual Exhaust with shorty ceramic headers, K&N typhoon CAI, SCT3 with 93 Brenspeed tune, BBK 70mm TB, Screamin Demon coil, JBA wires, Drilled and Slotted Rotors. J&M rear lower control arms
Visual Mods~ 17" boss rims on nittos 255/45's, clear front turn signals, chrome upper billet grille, window louvers, shaker500 w/ jlaudio 12" sub an amp in the trunk for some thump. kenwood excelon kdc-x396 deck