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Discussion Starter #1
I just saw a commercial for Flowmaster on Trucks! on SpikeTV and they said the muffler would improve gas milage. How much would an offroad pipe (remove Cat), flowmaster, and exhaust improve gas milage in a ford 5.0L?
 

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Building gold from crap
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depending on the truck, removing the cat will reduce your mileage

i saw a good increas with my headers, 3"hiflow cat and 3" exhuast system

with a open K&N i went up a few miles, not a whole lot thouhg,
 

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I removed the cat had a true dual exhaust w/flowmasters put in got a couple more miles out of it not to much though "but it sounds great"
:chili: :chili: .
 

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OUT OF BUSINESS / M.I.A.
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5.0L truck intakes flow pretty good, the exhaust is not so great.
Not sure about MPG inprovment, most drivers "use" the increased power ;)
right foot always effects MPG
 

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I put a single 3" and a K&N Replacement filter on a 94 F150 I had. I picked about 4 MPG. Plus it sound alot better. Is your Rig Injected or carburated? This may be a place to pick up a few miles....maybe
 

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Are those REAL?!?!
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OK, in my experience from Stangin'... if you open the exhaust TOO much, you will lose low end torque and your mileage will decrease in city conditions (also, likely to affect your off-road adventures ) The key is still the same principle as for what does what and how. MATCHING. Match your parts wisely and with some forethought, and you'll be fine. If you open the backside (exhaust), you may need to tweak the front side (intake) Remember, your motor is in it's most basic description, an AIR PUMP (of sorts) so with that said, apply physics properly....

Flowmasters, although, I don't like them a whole lot, cuz they resonate UP through the vehicle, and not out the back. I like the Flowtech Terminators mufflers... they sound great, they flow as well as Flowmasters, but they aren't noisy in the vehicle... my opinion, this is not a knock or a flame... we all have a preference with these sorts of things... :) Anyway, Flowmasters are good mufflers...


My .02

Thanks...
 

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Discussion Starter #7
well...I'm not exactly brand loyal...what I'm looking for is how can I pick up milage on my EFI 5.0 with 156K miles on it and stock headers, assuming I can remove the Cat here in Michigan..... and how much can I gain? with a 35 gallon tank, spending $200 on exhaust....picking up 3MPG I get my investment back in maybe 2 weeks!
 

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I'm in the same boat.Mine is a '89 EFI 5.0l with(true duals). I have a set of 2 chamber flowmasters that I was gonna put on if I can find some headers.I'm getting 10 to 12 mpg now.LOOKING FOR MORE!!
LONEWOLF
 
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