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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.
Could be a broken joint between the muffler and the exhaust pipe.
Could be a loose coupler on the exhaust pipe .
you could get it checked at an exhaust service center where they can hoist car up and look under the car and give you a report on iys cause and likely cost to fix.
If you have no catalytic converter and replace the muffler with a straight pipe,, you WILL NOT BE ABLE TO HEAR YOURSELF THINK!!.. I took the converter off mine and it was SOOO loud.(have a Flowmaster dual outlet).. It WAS TOO LOUD.. I put a 28" "glasspack" inline..WHEW.. I can actually hear the radio now!!!
-Muffler pipe connector could be loose. -Could be a "hole" And depend on how many part need to replace or just tight down. -It could run from 150-400 (If replace the whole muffler line, it'll go up to 800)
I've just bought a K13 Nissan Micra and it doesn't sound quite right. The noise I hear also seems to be coming from the back but it sounds like when you chop down a gear in a manual going down a hill and the engine revvs, well this is the noise I get in the automatic speeding up and slowing down, even just cruising at a steady speed. Any ideas people? Apart from this noise I love this car.
Sounds like (no pun) your muffler and/or resonator are wearing out internally. After internal parts wear, they can make strange harmonic sounds. Sounds change with fuel, air filter and general tuning of car. Have a good muffler shop listen to it and take them in test drive to witness what you're hearing.
Based on your description: 150K+left rear slowed down much quicker than the right +/ and the humming noise, there is a great possibility that the Wheel Bearings will have to be replaced.
If the noise sounds like your muffler, but isn't coming from the area of your muffler, then you have an exhaust leak upstream from the muffler.
From the front of your muffler, follow the tubing forward to the catalytic converter, then forward to the engine exhaust manifold.
If you start with the car sitting for a few hours to make sure it's cold, you can use your hand to feel for blowing leaks while the engine is running, but chances are you'll be able to hear it. be careful of the catalytic converter itself, as it heats up fast, so check that first.
Once you've found the leak, the fix depends on the emissions laws in your state. If you have none, and the leak is in the middle of the pipe, you can buy pipe patchers (metal preferred) through auto parts stores or catalogs/websites. If you have strict emissions laws, or the leak is at the junction of the catalytic converter and pipe, you'll need to replace the failing part.
Most aftermarket exhaust systems are cat-back. You defiantly need to keep the cat to comply with local emsisions regualtions. However you can remove the mufflers and replace them with high flow mufflers or resonators. Try to replace them with something not too loud so you are in accordance with noise laws in your area. I have a 2000 s10 with no mufflers, just a cat then a y-pipe to make it dual with two resonators coming straight out the back, I live in the states and made sure this sytem was 50 state street legal before I purchased it. I suggest you do the same to avoid harrasment by the police.
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