to downpipe or not - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 6 (permalink) Old 06-11-2013, 02:55 AM Thread Starter
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to downpipe or not

Hey everyone I have an early 99 7.3 I use the truck for my daily driver so its a stock 4x4 ride height and everything is stock except the air filter I installed a 6637. I want to free up the exhaust as its original and I plan on putting a 7" stack in the bed. My question is should I replace the stock downpipe with a d.e. 4" dp? Is it going to be worth it to get a 4" dp to a straight pipe and a 4-5" than a 90į and straight out a single 7" stack? Or should I just chop off the muffler and tailpipe and run a 90 the stack ? Its only a daily and all I want to do is get MPG's. And of coarse satisfy my cool meter for a DD
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post #2 of 6 (permalink) Old 06-11-2013, 03:53 AM
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Re: to downpipe or not

Hell I have an exhaust from down pipe to stack, all stainless I'd part ways with
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post #3 of 6 (permalink) Old 06-11-2013, 05:15 AM
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Re: to downpipe or not

Mine is a 3" dp to a 4" exhaust and it works pretty good.

2001 F250 CCLB, PHP Hydra, 6637, MBRP 4" exhaust and rear air bags

97' F250 ECLB, 7.3, Baby Swamps, Hydra w/swamps tunes, 6637, 3"dp 4" straight, Dana 60, 2.25 PMF RSK, Built Trans & Cooler, DIY efuel
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post #4 of 6 (permalink) Old 06-11-2013, 06:01 AM
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Re: to downpipe or not

Imo if you don't throw a bigger do in it you are robbing benefits of having a new exhaust, mine if 4" all the way, I've put in a 4 dp to 5" exhaust ending in dual 6" stacks and he was happy with it, the main restriction to a straight exhaust is your do, throw in the biggest one that fits.

02 250 CCLB, 6 spd, PHP Phoenix, ISSPROs, AFE/6637 intake, 4" DE straight exhaust, WW, coolant filter with ELC, AIH delete, ebpv delete, bellowed uppies, 4" on 35's and racelines
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post #5 of 6 (permalink) Old 06-11-2013, 12:59 PM Thread Starter
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Re: to downpipe or not

Ya I know I really should get a new dp just to free it up so more than likely that's what I'll do. Thanks guys
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post #6 of 6 (permalink) Old 06-11-2013, 11:48 PM
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Re: to downpipe or not

depends on how many mods you have some mostly stock (ie chip only)trucks gain torq down low with a 3.5...vs a 4

Early 99 f350 4x4 crew cab, auto. pmt2 pcm
2001 cup holder ,T500, MAX AC ASSIST AC mod, Diy Twin tymar, TS chip, Powerslots & Hawk pads, ford AIC, ..... with big fat want to list.
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