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straight pipes effect gas mileage?

Old 10-07-2008, 11:22 AM
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Default straight pipes effect gas mileage?

I am thinking about putting a straight pipe on my 88 ford bronco. i am leaving the cat on. will this lower my gas mileage or change it at all?
Old 12-17-2008, 12:44 AM
Join Date: Jul 2008
Posts: 11
Default RE: straight pipes effect gas mileage?

I think not. Straight pipe will not lower your gas mileage but will maintain it and just give your car better performance.

how to save gas
Old 12-18-2008, 09:04 PM
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Default RE: straight pipes effect gas mileage?

Straights can create better flow of exhaust gas but I'm not sure if it can increase fuel mileage.

Old 07-20-2010, 12:08 AM
Join Date: Jul 2010
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Thumbs up

No effect,
No power difference,
No damage.
The only thing you would change is the sound.
In theory it would run lean on fuel, but it won't in the real world because assuming your O-2 sensors are working they will compensate.
Old 07-20-2010, 03:45 PM
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Location: Midwest
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Why do you want to leave the cat? I got considerably more power when I cut mine and put the straights on. Gas mileage improved too
Old 05-20-2012, 09:08 AM
Join Date: May 2012
Posts: 1
Default Nope

I straight piped my truck completly granted there is and arguement that if theres no back pressure the engine will loose some power in the low and mid range. Thats a theroy and in no way true, if your really worried about it like i was at the time throw in a TBI or Carb spacer i noticed a big improvement on the butt dynoo
Old 05-21-2012, 09:56 AM
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Join Date: Apr 2012
Posts: 81
Post straight pipes effect gas mileage?

Straight pipe has no effect on engine performance and it's not going to lower the fuel efficiency. The only worse thing about it is its noise; yes it has a very loud and annoying sound.
Old 06-29-2012, 10:58 AM
Join Date: Jun 2012
Location: wisconsin
Posts: 4

at first your milage will be amazing because your afraid to sick your foot in it because of tickets however youll eventually build some confidence and develope a lead foot to hear the pipes flowin'. you will see a drop in low end proformace but that powers not lost its just put in the high RPM range so youll have to mod your engine to compensate if it drives you crazy like me. but dont run true duals use your exhisting header Y pipe and then use a second Y pipe to split into duals that should prevent crackling if you use the right size pipe and keep enought back pressure to insure you exhaust valves dont cool to quickly.
Old 01-24-2019, 11:38 PM
Join Date: Jan 2019
Posts: 1
Default Does having an exhaust reduce the noise from a straight pipe?

I plan on getting a Y pipe for my 2000 Chevy Silverado 5.3 because my cats went out but i was wondering since I have the flow master super 44 installed right now that it would limit the noise?
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