Straight Pipes cause bad gas mileage? - Ford Forums

Jeff29 · 07-31-2006, 19:04

Since i had those kind of pipes installed on my truck i noticed a decrease in mileage. Should i have a muffler installed on my truck like magnaflow or flowmaster.

skid · 08-02-2006, 02:42

hey
straght outs should improve ecnomy but if they over scavange then a little worse millage might happen.
you also might be driving it a little harder if the torque has droped off a bit.

drift

ford_hick_5 · 12-07-2006, 12:40

i just cut the muffler out of my truck and i've noticed an increase in horse power, torque and gas mileage. But its still 2 into one.

VictourB · 02-08-2007, 21:07

Straights should flow better creating better gas mileage. what happens is you punch it harder to hear it Roar.. More often..

forestranger · 04-08-2007, 18:27

if i staright pipe my truck, should i worry about blowing holes when im welding it or should i jsut clamp it or what?

VictourB · 04-08-2007, 21:13

Well I always weld mine I hate clamps.. I would say it depends on how good of a welder you are. just weld Vert. down On the sides and it will hold it fine. I would use a 6011 on about 95 amp..

forestranger · 04-09-2007, 14:51

or should i just mig it. i can overhead so i might do it when its on my truck.

VictourB · 04-09-2007, 21:44

I would Mig it. I didn't think you had one because you spoke of burning holes.. I have a mig also that I prefer when I am not out of gas like now. lol

forestranger · 04-09-2007, 22:01

lol yea , im doing it in my fabrication calss so i have everything.and whem im putting the pipe inbetween should i make it so it fits inside the existing exhaust or over it?

Sand1 · 04-11-2007, 19:01

This is a very technical area you have ventured into. What has probably happened is, you lost your low end torque by removing the mufflers. I would assume that would mean it needs more gas than it would have before to get moving. The whole thing is based on volumes and pressures and things that make me dizzy to think about. You really probably should have some sort of mufflers, or smaller diameter pipes.