bhop
15+ Year Contributor
- 1,462
- 4
- Aug 26, 2004
-
Los Angeles,
California
I'm wondering if exhaust size could have any effect on gas mileage?
First off, I have a RRE downpipe, high flow cat (3") and 3" Apexi N1.
About a week and a half ago, I got my car back from the shop, but it had an exhaust leak which was a little loud, so I stuck in my exhaust silencer (which obviously narrows down the exhaust exit), just until I could get the leak fixed, which I did this past weekend. I took the silencer out today, and it seemed like my gas needle moved a lot farther than usual, compared to when the silencer was in, so i'm curious if it's just my imagination, or is it possible that an exhaust that doesn't flow as well will give you better mileage?
First off, I have a RRE downpipe, high flow cat (3") and 3" Apexi N1.
About a week and a half ago, I got my car back from the shop, but it had an exhaust leak which was a little loud, so I stuck in my exhaust silencer (which obviously narrows down the exhaust exit), just until I could get the leak fixed, which I did this past weekend. I took the silencer out today, and it seemed like my gas needle moved a lot farther than usual, compared to when the silencer was in, so i'm curious if it's just my imagination, or is it possible that an exhaust that doesn't flow as well will give you better mileage?