Tip & How-To about Saab 9 5

DIY Replace Back Muffler / Resonator with Straight PipeSubject: DIY Replace Back Muffler / Resonator with Straight Pipe Title: Increase Fuel MPG by Replacing Back Muffler Overview: When your back muffler fails, and or if you want a bit more gas milage, replacing the back muffler with a straight pipe seems to work fine and increase MPG. This is much cheaper than purchasing a back muffler with DIY or to have a local customer shop install a straight pipe. Symptoms: Back muffler failing, onion peeling and / or holes in the back muffler. Experience Level: Medium Tools Needed: Hack Saw, Ratchets, Wrenches, etc. Time Needed: About 1 hour: Parts Needed: Pipe parts from local auto store. Exhaust sealers, hangers, pipe tip (stainless) Procedure: Remove the back muffler by cutting the pipe before the muffler about 2 inches in front of the muffler. Replace with straight pipe components or have a shop do it. You will need some time to get it 100% right. It took me a couple of tries. Outcome: - Money savings in replacement. - Slightly louder, but not much. Actually a better sound (subjective) - 1-5 MPG gas savings, especially on open road. Discussion: I have done this on a 99 9-5 I4 for about 1 year now and it seems to be working fine. I am getting about 3+ MPG on the open road since this was done. It is an automatic with 140k miles solid 29-30 MPG with regular fuel on the open road. I really do not see the need for the back muffler / resonator at the present time. I will be doing this on a 2001 V6 wagon soon. The muffler will be failing soon.

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Last time. I have Ford focus 2003 sedan dohc 2L. I lost a part from exhaust system. from back to front I see 1. tail pipe 2. rectangular box shaped part? Lunch Box? 3. missing part Muffler?


Starting from the front, coming off the exhaust manifold should have, 1. Exhaust pipe, 2. Catalytic converter, 3. Exhaust pipe, 4. Resonator, 5. Tail pipe. Also, there should be an Oxygen sensor somewhere around the catalytic converter.

Jul 02, 2017 | Ford Cars & Trucks

1 Answer

What exactly is muffler drone?


an un baffled exhaust noise
causes the drone

resonators explained
How Mufflers Work
that set up has no back pressure on the exhaust manifold
almost straight pipe system


I didn't have this problem when i was running my factory mufflers and resonator.

you took out the resonator

Oct 30, 2016 | Dodge Cars & Trucks

1 Answer

2003 Chrysler Town and Country Exhaust does it make a difference if the muffler is first and then the resonator last? that is what Midas did to my van and its louder now with the new exhaust


Yes, the muffler should be upstream of the resonator. In other words, from the engine, you have the catalytic converter, then the muffler, then the resonator is last, near the tail pipe. Possibly they installed the wrong muffler or resonator. The muffler will have the most effect on the sound you hear.

May 30, 2011 | 2003 Chrysler Town & Country

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