new exhaust = less power? - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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post #1 of 10 Old 12-30-2011, 07:44 AM Thread Starter
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new exhaust = less power?

I've been looking at the 4" MBRP t-back (6212AL) to install along with the EGR delete I recently purchased, but I keep seeing comments in various threads about how after-market exhausts can actually cause a loss of power, most recently in the looney thread.
questions:

If I'm not towing heavy or racing and have no problems with EGTs (with my current use and driving style), do I really want to change exhaust and potentially lose power?

Does this power loss occur on aftermarket exhausts that eliminate the cat but still use a muffler (backpressure)?

Does it really make a difference on these kits that retain the stock-size down-pipe?

Sorry for the long post and multiple questions, but it seems like pretty much everyone agrees that exhaust is one of the best (and cheapest) upgrades you can make. I guess I just need convincing that the lower EGTs and slightly quicker spool are worth it on a truck that is otherwise all stock except for the tune.

Thanks

2006 F-350 FX4
SRW CCLB
Done:
SCT with Quick Tricks tunes
Dieselsite Coolant Filter
blue spring upgrade
CCV re-route
high idle on Aux 4
Next:
exhaust
level and 35s

FOR SALE
1999.5 F-250 2WD
SRW SCLB
K&N, 4" Turbo-back, Superchips
Brian's Truck Shop 4R100
B&W Gooseneck, overloads, Tekonsha Voyager
189,000 miles

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2005 VW Jetta wagon TDI
117,XXX miles at 38-46 mpg
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post #2 of 10 Old 12-30-2011, 08:46 AM
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I put a 5inch on my truck. IF there was a loss of power, I couldn't feel it. Maybe if you dynod before and after you could see one, but I never felt it. I love the exhaust and I'm glad I did it.

2005 F-250 Lariat FX4 CC SB
Sinister EGR Delete
Diamond Eye 5" Turbo Back Straight
OEM Gaskets and ARP Studs...
SCT X3 (Quick-Tricks tuning)
S&B Intake
Edge CTS
Full Syn 15w-40
High idle mod
PMM Coolant Filter
Rebuilt FICM with Atlas 40

2006 F-350 XL RC/Flat Bed
EGR Delete
SCT SF3 (stays on tow agg)
FARM TRUCK


Diesel spark plugs are the bestest spark plugs....
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post #3 of 10 Old 12-30-2011, 09:35 AM
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There is many magazine articles and website that show dyno #'s go up after a turbo back exhaust is installed plus lower egt's. I installed mine just a few days ago and it runs great, but I can not feel a gain or loss of power. I got it mainly because I wanted lower egt's and better mpg.

05' f250 6.0 powerstroke 4x4, KC 1.5 turbo, Bulletproof 4 phase ficm, blue fuel pressure spring, dfuser coolant filter, MBRP turboback cat delete, SCT w/Gearhead SRL, 8k, unlimited tow, WPE White ghost, and Max tow. Edge CTS w/ EAS egt probe.

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post #4 of 10 Old 12-30-2011, 03:34 PM
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I'd imagine the "loss" of power is with the bigger DP the turbo may lag a little more. Exhaust is more of a lowering EGT mod than a power mod.


2006 F-250 XLT
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post #5 of 10 Old 12-30-2011, 08:03 PM
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the benefits greatly outweigh any percieved loss of power

-Matt

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post #6 of 10 Old 12-30-2011, 08:27 PM
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But everything I have ever read never dynoed a loss. Has anyone dynoed a loss of power post an exhaust install?

05' f250 6.0 powerstroke 4x4, KC 1.5 turbo, Bulletproof 4 phase ficm, blue fuel pressure spring, dfuser coolant filter, MBRP turboback cat delete, SCT w/Gearhead SRL, 8k, unlimited tow, WPE White ghost, and Max tow. Edge CTS w/ EAS egt probe.

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post #7 of 10 Old 12-31-2011, 04:57 AM
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I think the turbo spools up faster, and definitely easier to hear. I didn't feel a power loss, I think it's worth it for the cooling alone.

2006 F250 King Ranch FX4 - (Build date Sept. 2005)
6.0L (Engine Build date Sept. 21 2005)
Dark Copper w/ Beige accent
Short Bed, Crew Cab, Sun Roof, Power Rear Window
18" KR wheels, Camper Package, Tow Command

Mods: Shaker 500 Stereo, Alpine MRV-F450 amp, Infiniti Speakers, Line-X, Edge Insight CTS w/pryo, Mag-Hytec Differential Cover, MBRP 4" Turbo Back Exhaust, Diesel Site Coolant Filter, Blue Spring upgrade, Fleetrite ELC, Fuel Pressure Guage, NCHornet CCV Mod, Swamps 58v FICM
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post #8 of 10 Old 12-31-2011, 06:19 AM Thread Starter
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Quote:
Originally Posted by cowens677 View Post
But everything I have ever read never dynoed a loss. Has anyone dynoed a loss of power post an exhaust install?
Don't know. Never really considered it until seeing comments on here, and never really took it seriously until post #126 of the "well, I'm looney" thread. I believe Vivian knows what she's talking about when it comes to making power in these trucks (I run her looney tune myself), so when she said
"If you go with a 4 or 5 inch exhaust it will be louder but you will notice a loss of power. Happens to everyone. Do not be concerned."
that got my attention. So I figured I'd ask.

Call it playing devil's advocate if you want

I still think that increasing efficiency of air coming in and air going out is always a good thing since the engine is basically a big air pump anyway.

2006 F-350 FX4
SRW CCLB
Done:
SCT with Quick Tricks tunes
Dieselsite Coolant Filter
blue spring upgrade
CCV re-route
high idle on Aux 4
Next:
exhaust
level and 35s

FOR SALE
1999.5 F-250 2WD
SRW SCLB
K&N, 4" Turbo-back, Superchips
Brian's Truck Shop 4R100
B&W Gooseneck, overloads, Tekonsha Voyager
189,000 miles

Wife's car
2005 VW Jetta wagon TDI
117,XXX miles at 38-46 mpg
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post #9 of 10 Old 12-31-2011, 06:40 AM
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I did not read that post, and you are right you would think she would know what she is talking about. But I would wonder why that is? And I would love to see some dyno result per and post an exhaust install.

05' f250 6.0 powerstroke 4x4, KC 1.5 turbo, Bulletproof 4 phase ficm, blue fuel pressure spring, dfuser coolant filter, MBRP turboback cat delete, SCT w/Gearhead SRL, 8k, unlimited tow, WPE White ghost, and Max tow. Edge CTS w/ EAS egt probe.

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post #10 of 10 Old 12-31-2011, 09:29 AM
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My first 6.0, an '04, the first thing I did was cut the exaust off and install 4", aftermarket intake, and several other things I THOUGHT I needed to do. After all I was coming from a 7.3, it was well established those things needed to be done, right?

Fast forward to when I traded in the '04 to the current '07, me along with the rest of the world were much more informed with the workings of the 6.0. I think back and say why in the world did I cut off a stainless exaust system and replace it with aluminized pipe. Unless you're tuned hard and towing heavy the factory system is just fine. I have replaced the stock muffler with a Grand Rock straight through, and I think my kitty may have been poisoned or something, its guts exploded.

On the '04 going to 4" exaust I did notice more turbo lag, but no noticeable power differences. That truck was an "early '04", which means when the exaust is opened up the turbo effects on the ear were quite pleasant. I had a guy that worked for me at that time who lived on a busy two lane highway, when I would drop him off after work he almost would insist that I wait for a tractor trailer to be close before I pull out, that way they could hear me step on it, true story.
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