Corolla 07 rusted exhaust flange

[Rolla07]

Hi all! Recently noticed the exhaust flange rusted and exhaust pipe is totally disconnected from muffler. Ive noticed my gas mileage is up based on loose calculations. After some research it seems power and mileage increases from not going through a muffler. It got me thinking..and besides noise wondering if the emissions offset the savings in fuel mileage? I assume this was thought of? Does the burning of less fuel from running without an exhaust exceed the pollution of running without a muffler? I got to thinking of possibly replacing the stock muffler with a less restrictive muffler. I dont mind it being a bit louder but within reason of course...after a 2 hr drive yesterday the noise was not bearable. Since I need to have it welded anyways i wonder if going aftermarket would be worth considering? Thoughts/opinions welcome.

 

[Anduril]

As long as you still have the cat and O2 sensors, emissions shouldn't be effected. Even the People's Republic of California allows you to modify your exhaust system after the last O2 sensor to your heart's content. I wouldn't drive with no muffler, but I will say that adding dual Magnaflows to my Cavalier gave me an extra 2-3 mpg, most noticeable at 75-80 mph for long periods of time.

 

[oilpsi2high]

You'll get fed up with the noise after a few more miles, trust me.

 

[Ducked]

Originally Posted By: Anduril
As long as you still have the cat and O2 sensors, emissions shouldn't be effected. Even the People's Republic of California allows you to modify your exhaust system after the last O2 sensor to your heart's content. I wouldn't drive with no muffler, but I will say that adding dual Magnaflows to my Cavalier gave me an extra 2-3 mpg, most noticeable at 75-80 mph for long periods of time.


Don't understand. How are they going to check tail pipe emissions if the exhaust pipe is broken?