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Fourth Generation Duramax Electronics/Tuners Discuss 2007.5-2010 LMM Duramax engine electronic upgrades including chips, tuners, programmers, etc. is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
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Old 01-26-2020, 01:28 PM   #1 (permalink)
Sparkplug Hunter
Join Date: Feb 2010
Location: OH
Posts: 1
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Hello everyone i just purchased a 2010 gmc duramax with 140,000 i went threw it with a fine tooth comb the highest injector balance rate was -.05 blew my mind away as they are still the original. The truck has spade jack tuner with 5 position switch on it but everything else is stock was wanting some advice of the best exhaust not really wanting to delete the dpf and egr right now. the truck right now is getting a little over 15mpg town how much would i benefit from straight piping it but leaving the dpf on or should i wait an do the egr and dpf delete at the same time or just leave the truck alone.
thanks for any an all advise.

2010 gmc duramax 140,000 miles
duramaxtuner spade jack tuner with 5 position switch

Last edited by OkDually; 01-26-2020 at 01:40 PM. Reason: prefix/sig
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Old 02-04-2020, 01:26 AM   #2 (permalink)
Diesel Prodigy
D_R_C's Avatar
Join Date: May 2007
Location: Rocky Top, USA
Posts: 4,073
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If your thinking �� you’ll gain mucho mileage deleting, I’m sorry but you won’t unless your having issues, which you probably eventually will with the DPF and EGR.
Stock I was getting about 14-15 in town after deleted, pretty much open exhaust except for the stock frontpipe w cat which I put back on about 1 1/2 years ago because of the exhaust stink 12.5 city with a little highway.
A drop in mileage, no gains.

I don’t know what tuning you have with Duramax Tuner but they stopped offering delete tuning around 5-6 years ago.
They do have a sister EFI company in Ca. that might help with what you’ll need if you start removing stuff.
Right now you can help it breath much better if you delete that restrictive stock muffler.
That was the first thing I did with everything else still intact, noticeable on the positive side.

2007.5 GMC "Black" Sierra SLT 3500HD SRW C.C. 4X4 LMM Z71
DIY stock airbox mod, aFe ProGuard 7, OEM drop-in
EFILive ECM ATP - Heavy Tow Tune with Turbo Brake
EFILive TCM Duramax Tuner
DHD Cold Side High Flow Intake Pipe, DHD PCV Re-route, AirDog 4G100
Castrol Hypuron/Vecton 15W40 synthetic blend oil
Donaldson P550832 2 qt oil filter

2007 GMC Yukon Denali "BLACK" 6.2 gasser, DIY stock airbox mod, K & N OEM drop-in, Airaid intake tube, EFILive TCM tuned
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