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#1
07-25-2010, 07:35 AM
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Some exhaust upgrade info
I'm buying a 2003 expedition, 5.4L I think, I don't think I'm getting the one with the 4.6L. My plans are to pretty quickly upgrade the exhaust system. My goal is not for power, but for fuel economy. I've heard the non mandrel exhaust is pretty restrictive on these trucks.
On a low budget, does anyone have suggestions to headers, and exhaust? What is the pipe diameter? Are there cat delete setups available? I would like to install headers, cat delete, and true dual exhaust with quiet mufflers. My short term goal is to get as close to 20 mpg as possible on the highway to justify switching from my explorer to the expedition. I have two high flow catalytic converters, 2 1/4" pipes, stainless. If they won't fit then I'll sell em. 
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#2
07-25-2010, 04:44 PM
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on my 03 4x4 xlt. i have a k&n intake and spintech cat back. on highway if i keep it around 1800 rpm around 68mph. i get around 18mpg. city driving around 14mpg. as far as true duals unless you turn down or go out in front of rear tire the independent rear suspension prevents a true dual setup exiting rear. no room for 2 pipes to exit.
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#3
07-25-2010, 08:20 PM
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look into a programmer like an EDGE CS... I'm averaging 11.9-12.1 MPG on 37s with the 3.73 gears still...
__________________
    Official Member of the LIFTED EXPY ClubOfficial Member of the Red Eddie Bauer Club 11" lift on 37s Your Import sounds like my @$$ after a night of mexican food My Lug nuts have more torque than your import
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#4
07-26-2010, 08:46 PM
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I see that headers come with 2.5" outlet/collectors. I guess I'll have to get 2.5" converters if I keep em. Anyone want my 2.25" ones? Also, the explorer uses a dual exhaust all the way back to the muffler, then single outlet after the muffler.... possibly it will help on the expedition if I do this?
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#5
07-28-2010, 01:52 AM
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the dual in single out helped my expy. i have a pic of exhaust setup in show and tell, if you want to see.
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#6
07-28-2010, 02:07 PM
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Quote:
__________________
  2004 5.4L 4X4 Expedition WeatherTech window guards WeatherTech hood screen WeatherTech floor mats Gott's Intake Modification Aries Bull Bar Hella 500FF Driving Lights
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#7
07-28-2010, 08:18 PM
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here are some pics of my two into one exhaust. if i can pics of my old 97 expy with dual in dual out exhaust i will post those.
Last edited by tallsville; 07-28-2010 at 08:19 PM.
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#8
07-30-2010, 01:35 PM
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That exhaust is really nice, I'm going to show those pics to whoever does my exhaust, so they do it right. Is there room to have a dual outlet muffler, with two pipes side by side right over the rear axle? That must have made a pretty big power gain, the stock y pipe is horribly restrictive looking.
__________________
-03' Eddie Bauer Expedition, 2WD, 5.4L, "Gotts" Mod
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#9
07-30-2010, 02:54 PM
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no room for dual pipes over independent rear suspension(irs). thats y i did a dual in single out. pics 3 and 4 show the single pipe going over rear axle. sorry light in 3rd pic makes i kinda hard to see
Last edited by tallsville; 07-30-2010 at 02:56 PM.
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