aftermarket exhaust question - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 10-07-2013, 09:02 AM Thread Starter
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aftermarket exhaust question

I have a 01 dually 7.3 diesel with 149k miles on it ... it has a stock exhaust and intake..but it has a bully dog programmer. I spoke with a tech at bully dog and they said its normal to have a stock or modified set up with their programmer. I just wanna know what is the best option..leave it stock or go ahead and straight pipe it with a 4 inch pipe from the turbo back. please give your opionion if there is better options. Thanks, Eric
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post #2 of 13 Old 10-07-2013, 09:49 AM
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Straight pipe it. The main flow restriction on the stock system is the restrictive muffler.

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post #3 of 13 Old 10-07-2013, 11:53 AM Thread Starter
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is it okay to straight pipe it with a stock filter set up?
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post #4 of 13 Old 10-07-2013, 12:23 PM
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Originally Posted by Ericr712 View Post
is it okay to straight pipe it with a stock filter set up?
Yes but you should spend the $50 to get a 6637 style intake also. Once you open up the intake and exhaust you will feel a bit more power and see your MPG's go up a bit.

I straight piped my exhaust and added a 6637 filter and gained 1.5 MPG.

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post #5 of 13 Old 10-07-2013, 12:25 PM
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im going to go 1 step further and tell you to take off that BD system of your truck... its not very good and can do more harm than good
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post #6 of 13 Old 10-07-2013, 03:33 PM
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bully dog isnt that good.

running it with stock exhaust and intake your egts must be ridiculous.

do you have any guages to monitor egt, or trans temp?

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post #7 of 13 Old 10-09-2013, 08:44 AM
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Hi Eric,
Nothing in your signature so I can see what else you have. As mentioned, you should have a set of gauges. The pyrometer (EGT) gauge is important. With that you'll be able to see what's going on with your EGT's.

With the chip a free flowing exh and intake are a very good idea. A straight pipe system isn't necessary, but a 4" turbo back system will lower those EGT's. A St pipe will be louder, so that may or may not be of concern to you. The 4" TB MBRP will flow just as good as their St pipe system but the sound will be less.

After teh exhaust you may still want your EGT's to be even lower. With the pyro gauge you'll be able to tell if it's necessary. There are a lot of intakes avaiable out there. I have the AFE Stage 2 on my 7.3L, but there are several to choose from. We only carry AFE, S&B, and Airaid becasue their quality. The Ford AIS is another viable option that I wouldn't hessitate to use.

Any questions let me know. I'll be glad to help.
DIESELMANOR GAUGE KITS for 1999-2003 Ford 7.3L Powerstroke
Ford 1999-2003 7.3L Powerstroke Cold Air Intake Systems at DieselManor
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post #8 of 13 Old 10-13-2013, 06:42 PM Thread Starter
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The bully dog is monitoring oil, trans temp and boost. No egt readings though. and boost always reads low. never seen it about 8 yet. Even at WOT in extream mode. Oil temp never gets about 180 and trans never been above 160. This is just as daily driving, not towing. I usually just keep it set on performance mode cause it helps with gas milage as long as I stay off the gas it gets about 20 in town. I will probably be doing to 6637 diy airfilter after doing some reading it seems to be cheapest way and does the same as buying a 300$ intake...still looking at exhaust options. is it a good idea to just cut the Muffler out and weld in a piece of pipe instead of replacing all the way from turbo back?
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post #9 of 13 Old 10-13-2013, 07:03 PM
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Get an EGT gauge please...

01 F-250 SC PSD,320k,16 Isspro Gauges, AFE-2,CCV Mod,IAH delete,map reg,Modded H2e, 6.0 IC, 230/100 from P.I.S, Studs, 910 springs, Forged rods, Water injection,Hydra chip-No Limit/Gearhead tuning, Swamps HVHF IDM, MBRP 4" dual's, Aero, 6" tip's, 4" Revtek lift, 37/12.5/16.5 MT's
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post #10 of 13 Old 10-13-2013, 07:09 PM Thread Starter
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i will look into that also. Is it easy to hook up a egt monitor your self? also can someone let me know how to update SIG. I cant find it. and does someone have a picture of what sensor to unplug to for the ebpv ****. I think its causing my hissing noise problem . I have a hiss at low rpms below 35 mph, constantly. rather its warm or not...Thanks for all the help.
Eric
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