I upgraded my 05's intake and it seemed to change my shift patterns, ran a little higher rpms before shifting and also gained a smoke cloud when stepping hard on throttle. I then dumped my stock exhaust can and added the aero 4040xl in its place and shifting went back to like it was stock. Now step on throttle and no smoke, even less than stock when stepping on it. Engine seems to pull much better as it breaths easier. Good mods to start with. I dont like to see my $$$ turn to black smoke from unburned fuel
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05 - 2500, 4x4x6 srw, 48re, aero, cai, other goodies