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I know this might be a noob question. I recently put a Exhaust on my 2001 civic EX. When the exhaust was put on, I had the muffler shop run 2.25 Inch piping from the convertor all the way to the muffler. Does that effect the gas milage because it seems that i'm losing more gas.

 
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i believe you do.

 
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yes, because aftermarket exhaust/header/intake generates more air flow from the engine, other words more gas usage

 
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shouldnt feel any huge decrease on gas unless u boost ur car

 
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Thanks for the reply. I have my stock intake still. A friend of mine told me if i get a cold air intake it will save a little bit more gas. He said that more air flow make the engine breathe easier which will use up less gas. Is he right?

 
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i always thought that too...but ppl tell me intake sucks in more air which means the car needs to spit out more fuel to balance the a-f ratio, thus u are actually using more gas... i dun give a damn which one, i can't notice that much differnce. Driving freeway at 70-80 mph, i get 380 miles on ~12 gallons. If i drive <= 75 and keep the rpm to 3k max, i can get more than 400 miles on 11 gallons. ^_^

 
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more means more fuel is required to keep the the air/fuel ratio correct.

 
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No. I have a K&N air filter, dc sports header, and dc tcs exhaust. My gas milage went up. It all depends on how you drive. I use to get 34-35 mpg and now I get 38-39 mpg. I havent changed my driving style. I still race a car occasionally, and hit close to red line once in a while.

 
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I have the Apexi WS exhaust and I'm not noticing a difference in mileage. I average 33-35 mpg depending on how often I redline, keep my air conditioner on and how much city driving I do. I have gotten 33-35 mpg on a completely stock car.
I do not have an aftermarket intake system and my car functions fine in the low end with the exhaust system.

 
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I think Green Civic might be imagining things, I cant say that an after market exhaust will affect the gas mileage in a negative way or if it will benefit, but I can honestly say from what I have read in the past and with experience with my current honda and previous hondas that intake systems DO cause lower gas mileage. Going back to what I stated previously...the more air that an ECU measures being fed into an engine, the more fuel is required to correct that air/fuel mixture, otherwise the engine would be burning more lean than it would be running stock, thus causing higher exhaust temperatures and premature wear on internal parts like rings, valves, etc. It only makes sense.

 
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on my ex coupe i was gettin about 34 mpg average and i got a max of 49 mpg on an all interstate run with my DC exhaust and 17s, i shifted between 3500-4500 rpm and about 1/2-3/4 throttle to get some decent power out of it, anything above 4500 and y ou can pretty much forget about your mileage being that good. also, id put it in 5th after i was up to speed, even as low as 20 mph, it was still smooth, and if i needed to Go id just drop a few gears.

depends on the driver though mostly, a lot of times when people get something that has to do with the engine(i.e. hearing intake/exhaust more, feeling the turbo spool up, etc) they tend to hit the gas more, like those people in hospitals that have that little button that shoots them with morphine everytime they hit the button

they get addicted, ya know?

 
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What you just said is also true and I do agree, however I still maintain that I am also correct in what I said.

 
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I totally agree with your first post, but I ant imaging anything. I would get between 34-36 mpg when completely stock. I was surprised to see my gas milage go up. I'm not BSing. The amount of fuel put into the engine depends on what rpms you are driving at. I usually shift at 2700 to 3000 rmps. Thats right at when the ex starts vtec. So I am shifting right before vtec ingages which alows more fuel to enter the engine. Last fillup I got 36 mpg only because I was a little harder on the gas because of the extra responce that the cold weather is giving the car.I check my air filter a lot and clean it when needed. Most of the time it is a dirty air filter robbing you of good gas milage.

 
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n00b question here... so for our stock cars do we replace the filter or do we clean it? and how do we go about it?

 
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If you use the stock filter, you replace it. If aftermarket, you clean it. You can get the K&N air filter cleaner, and use that for aftermarket filters. There is a cleaner and filter oil that you use. Hope that helps

 
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im not saying your wrong cracker, what you said is true too

 
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An exhaust system can increase or decrease your gas mileage. It will increase your gas milage if the power being produced by the engine is comparable to hte exhuast piping, (add header, intake, etc.). If you have a stock ex engine and you increase the piping to 2.25 in. Your gonna lose gas because the piping is to big. To much air flow. As for the cleaning of filtering. I've used the K&N filter cleaning kit on my injen filter and it worked fine.

 
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yes, but not to a point where you would lose like 100 miles per fill up