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Old 01-02-2011, 12:52 PM
kellys kellys is offline
Junior Member
Join Date: Jan 2011
Posts: 1
Default What to do to exhaust and mods for fuel economy, 2006 Dodge Cummins 3500 Mega Cab

2006 Dodge Cummins 3500 4x4 Mega Cab what shold i do to the exhaust and what is the best programer and any other mods to improve fuel mileage> Also, what is the biggest tire i could use with out a lift?

Thanks for any information.

Last edited by stodg73; 09-21-2012 at 08:31 AM.
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Old 01-02-2011, 01:12 PM
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MnTom MnTom is offline
Join Date: Nov 2010
Location: Near Duluth, Mn
Posts: 4,912

Hi Kellys, and WELCOME!! Far as exhaust I would recommend that you get it free flowing as you can (straight pipe, high flow muffler). You can't get air in if you can't get it out. For a programmer I have read that a lot of guys like either the Smarty or an Edge. You want to be able to add a little timing for better mileage, but the best controller for fuel mileage is just under your hat!! A light foot goes a long way, but it ain't as much fun....... I think you can go to a 315/65 tire without much of an issue. I am sure that others with more experience will chime in.
1996 RAM "Custom Ground" 100 plate 3/4 forward, 300 injectors, 16.5 timing, Goerends Auto = 365HP, 833TQ Third Gen Rims, Aluminum Headache Rack
Duct Tape can't fix stupid, BUT it can muffle the sound

Last edited by MnTom; 01-02-2011 at 04:58 PM.
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Old 01-02-2011, 01:35 PM
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bobcat67 bobcat67 is offline
Join Date: Dec 2010
Location: Bozeman, MT
Posts: 19

the size of tire depends on the size/offset of the wheel, you can easily clear 35''s on factory wheels without rubbing, granted every truck is different and depends on how you want to do things
2006 Dodge Ram 2500, to many mods to list, in the process of obtaining 7.0L from a 5.9L block, crazy maybe, possible, yes
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Old 01-02-2011, 09:14 PM
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stodg73 stodg73 is offline
Out There, Savin' Lives
Join Date: Nov 2010
Location: Southern Colorado
Posts: 2,321

Welcome to the Site!!!!!!

Here is some information for you: suggested upgrades

This will give you a start as to upgrades.
O.O., 01.5, Dodge, 2500, High Output (H.O.) Cummins Turbo Diesel (245/505), Quad Cab Long Bed (QCLB), 4x4, Sport, Original Bosch VP 44 Injection Pump, 6 Speed/NV5600 Transmission, 3.55 Gears, 105k, currently stock engine, Fram Air Filter, 285/75R16s, Glow Shift Gauges: Fuel Pressure (FP), Boost, Exhaust Gas Temperature (EGT), Oil Temperature, SMARTY@1, Airtex lift pump 19 psi @ idle, 14 psi @ WOT, Propane Injection, 2 Stroke Oil, Intake Air Temperature (IAT) Fooler = Better MPG, Bed Lined, Chrome Nerf Bars, more to come!!

'79 CJ5, 258ci, 3" lift, 33x12.50x15, Stock Engine and 3 Speed Tranny
'05 Suzuki, GSX1300R, Hayabusa, All Stock, #3('00 blown engine, '00 stolen, & '05)
The complete live & learn and pass it on by H. Jackson Brown, Jr.
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