HP/TQ gains from just removing DPF and MBRP 4" - Page 2 - Chevy and GMC Duramax Diesel Forum
07.5-2010 LMM Performance Parts Discussion Discussion of Performance Parts For the 07 and up LMM Duramax Trucks No Advertising

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Old 12-25-2012, 12:55 AM   eBay Motors  #11 (permalink)
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He probably also tuned it. They were giving stock tunes with dpf turned off mileage

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Old 12-26-2012, 12:28 PM   eBay Motors  #12 (permalink)
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I have done exactly this on mine. Diamond Eye 4" with muffler, deleted dpf and shutoff egr. I have not noticed any great increases in mpg, although we are getting into winter fuel and longer idle warmups. I have tracked every tank since I bought the truck in Oct 2011 (81k mi), deleted in Nov 2012 (101k mi). I am trying to see if there is any significant change before I buy some tuning, but have a feeling the tuning will do more for mpg than eliminating regens and exhaust restrictions.
current: 07 LMM ec/sb ltz black & black, DE 4" turbo back, egr shut off, Edge Insight CTS
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Old 12-26-2012, 01:03 PM   eBay Motors  #13 (permalink)
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Biggest thing is cooler EGT's and maybe better throttle response and mileage, less back pressure should let the turbo spool a little better.
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Old 12-30-2012, 09:41 PM   eBay Motors  #14 (permalink)
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If I remember correctly, my LMM did 310hp stock with DPF and everything. With the 5" straight pipe (no tuning yet) it did 330hp. All my truck did without a tune though was back out of the first garage bay and pull into the next where it dynoed. I think you'll run into issues if you delete the DPF and don't tune it.
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