best exhaust for towing - Chevy and GMC Duramax Diesel Forum
Aftermarket Mods. Discuss what Mods are right for you.

 
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post #1 of 6 (permalink) Old 06-08-2019, 11:42 AM Thread Starter
 
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Question best exhaust for towing

We have a 2003 Duramax dual with a 8ft bed. We out a big ass pickup camper on it and then tow a car hauler with a jeep on it.
I had installed an aftermarket exhaust (5") about 10 years ago. but only from the down pipe back. This exhaust is all rusted and cracked and falling off. So looking into replacing it.
And was thinking about replacing the whole exhaust. manifold's on back.
My question is will I see an improvement in mpg enough to pay for it self?
Or should I just put a stock one back on?
We also have a banks aftermarket filter / filter housing on it.
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post #2 of 6 (permalink) Old 06-08-2019, 02:07 PM
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4" would be fine, you won't gain anything manifold back other than bragging rights, as long as your downpipe is still in good condition and you have no exhaust leaks, just leave it on.
Aftermarket downpipe is another part that will not do anything for you, except for lighting your wallet, a lot of labor and again bragging rights. .
You might consider stainless, Diamond Eye has the most reasonable prices on stainless steel exhaust that I've found.

Dan
2007.5 GMC Sierra 3500 SRW L.B. "BLACK" 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


2007 Yukon Denail "BLACK" 6.2 gasser
DIY stock AirBox Mod, K&N, Airaid intake, EFILive TCM only tuning
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post #3 of 6 (permalink) Old 06-08-2019, 07:39 PM Thread Starter
 
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Originally Posted by D_R_C View Post
4" would be fine, you won't gain anything manifold back other than bragging rights, as long as your downpipe is still in good condition and you have no exhaust leaks, just leave it on.
Aftermarket downpipe is another part that will not do anything for you, except for lighting your wallet, a lot of labor and again bragging rights. .
You might consider stainless, Diamond Eye has the most reasonable prices on stainless steel exhaust that I've found.
The whole exhaust needs to be replaced from the down pipe on back.

Only reason for thinking about replacing everything including the manifolds was to get better mpg.
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post #4 of 6 (permalink) Old 06-08-2019, 07:46 PM
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Then just replace the exhaust from the downpipe back, manifolds will NOT net anything especially mileage.
Check out Diamond Eye SS exhaust, it really doesnít cost all that much more than aluminized.

Dan
2007.5 GMC Sierra 3500 SRW L.B. "BLACK" 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


2007 Yukon Denail "BLACK" 6.2 gasser
DIY stock AirBox Mod, K&N, Airaid intake, EFILive TCM only tuning
D_R_C is offline  
post #5 of 6 (permalink) Old 06-21-2019, 10:43 AM
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Quote:
Originally Posted by D_R_C View Post
Check out Diamond Eye SS exhaust, it really doesnít cost all that much more than aluminized.
x2 on going with DE. I had some issues and they were very helpful.

As far as increasing mileage, i seriously doubt... and i mean SERIOUSLY DOUBT... you could find a mod/tune that would increase your mileage enough to pay for itself in less than 5-10 years (likely 8-10 years). An engine can only be so efficient (if you're feeling nerdy google Carnot cycle).

The best bang for your buck regarding increasing mileage: reduce drag. If you can reduce drag even the slightest i promise you will increase mileage (all other factors staying constant, of course).

07 Bowtie LMM CCSB Z: Nice truck, mad wife, empty wallet.

With all this "gun control" talk I haven't heard one politician say how they plan to take guns from criminals, just law abiding citizens.
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post #6 of 6 (permalink) Old 06-21-2019, 06:06 PM
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My mods I actually lost a little mileage compared to stock, which means they will never pay for themselves, but they are good for bragging rights.
Cooler egtís, a little more power makes for a little smile.

Now being able to have a little better mileage temporarily, a slight down grade really helps.

Dan
2007.5 GMC Sierra 3500 SRW L.B. "BLACK" 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


2007 Yukon Denail "BLACK" 6.2 gasser
DIY stock AirBox Mod, K&N, Airaid intake, EFILive TCM only tuning
D_R_C is offline  
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