I love my Smarty Jr ! Plenty of towing power and smoke ! I average 17.1 to 17.5 mpg's (empty) with the best of 18.8 hand calculated. (Lie-o-meter says 19.1 to 19.5 !!) I am happy with my combination. Look my sig, you won't be sorry.
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4.5 D3500 auto 4X4, Smarty Jr, van Aaken 3.1, Dipricol gauges, straight piped, silencer ring MIA,Stage II AFE w/ Amsoil nano-fiber filter, CFM+ and heater delete, Amsoil from end to end, Silver Bullet HD Trans w/ Billet converter !! 9/27/08 427hp and 815tq !!!