Performance and Accessories 2nd gen only Talk about Dodge/Cummins aftermarket products for second generation trucks here. Can include high-performance mods, or general accessories.

3" vs 4" strightpipe

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Old 04-02-2005, 11:17 PM
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3" vs 4" strightpipe

how much of a difference in egt's would the 4" make over the stock 3"? I'm planning on adding an Edge comp box and maybe some mild injectors and was wondering if the added expense of a 4" system would be worth it. Or if the stright through 3" would keep my egt's around the same. Thanks for your input!
Old 04-02-2005, 11:22 PM
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i left about 3 foot of three inch on the turbo and then put 4 inch on to 5 inch stacks and it droped 135 on criusein egts.
that was from 3 inch with resonater to 3 to 4 to 5 straight piped
Old 04-03-2005, 08:59 PM
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anyone else?
Old 04-03-2005, 09:03 PM
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When i pulled my 3" with cat off, for my straight 4", EGTs dropped around 250-350* at full throttle 5th gear. Cruising they dropped around 200-250*.
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