cat. con. honeycomb material may have gone downstream and is plugging the muffler. this happened to me; had to get a nerw muffler.
If you remove the catalytic converter you will be in violation of Federal and some state environmental regulations. The vehicle will run just fine, but you'll pay if you're caught. Removing the catalytic converter reduces back pressure on the engines exhaust and can increase the engines performance by a small amount, The converter burns off small amounts of excess fuel that escape through the exhaust and other gases to reduce the pollution levels produced by the engine. eventually the honeycomb material in the converter may become clogged and cause problems with the engine performance ,it then needs removed and replaced. However since some converters can cost hundreds of dollars there are millions of quick fix mechanics that remove the old converter and chisel out the honeycomb material leaving the converter housing intact and the inside empty and then they place the converter back on the exhaust system. The vehicle will fail an emissions test but will run just fine otherwise. If the car is a late model with a computer and oxygen sensors, the computer will adjust the air/fuel ratio to try to get the now non existent converter to work. This can really hamper performance and economy. It will also turn the check engine light on. Additional Note:: If a non-functional converted is used you must by pass the oxygen sensor/s to avoid check engine lights and keep the computer from adjusting the fuel/air mixture to compensate for the empty converter,some models have an oxygen sensor both before and after the converter,this easily done by purchasing a dummy oxygen sensor/simulator that tells the computer the mixture is with in normal limits these can be found at any auto parts store under the off road parts..You can also just unclip the oxygen sensor wire and loop a resistor between the terminals of the wiring to achieve the same result however the size of the resistor varies with each make and model..
No, an exhaust tip is a purely cosmetic upgrade. It will neither make your car louder, quieter, nor more fuel efficient. Neither will it give you any more horsepower. It will, however, make your car look cooler, especially if it's chrome. The cosmetic exhaust tip will usually be larger diameter pipe than the factory exhaust tip. This is intended to look like an upgraded exhaust system made entirely of larger, straighter pipe. Were you to replace your entire exhaust system (or even a large part) from the manifold down to the catalytic converter and back to the exhaust tip you would probably achieve "better sound." You would also improve your fuel efficiency and performance because the back pressure on the engine would be reduced. You might also damage or remove your catalytic converter, causing your car to release more un-combusted hydrocarbons, thus polluting the atmosphere and (more to the point I think) failing any emissions testing you might be subject to. Don't mess up your cat! no but they look cool on your ride!
That term refers to the portion of the exhaust from the catalytic converter on back to where it ends at the rear of the vehicle. They generally use larger pipe than the stock system. Good systems will have mandrel-bent turns that allow the exhaust gas pass with as little back pressure as possible. The mufflers in these kits are often glasspacks to reduce back pressure. It is more of a improvement in sound than performance, it will help achieve a deeper sound that is lacking in small displacement engines and improves horsepower very little. An improvement is there but hardly worth the cost as a performance upgrade.
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