Skip the auto shop - Our mechanics make house calls

Q: What happens if i replace the catalytic with a thrush muffler and put a DC sports exhaust about 2 feet away from the thrush.

asked by on

What happens if i replace the catalytic with a thrush muffler and put a DC sports exhaust about 2 feet away from the thrush. Will this sound bad? Will it make a difference on the HP and Gas mpg. Thxs

My car has 200000 miles.
My car has a manual transmission.

Removal of the catalytic converter on a car that will be operated on the street is very illegal, and can get you a huge fine from the EPA. Also, since most modern vehicles are designed to run with some system back pressure, you may actually notice a decrease in performance, due to the way exhaust flows out of the manifold and through the system.

The vehicle will certainly be louder, and may or may not sound better, depending on who’s listening. Generally small displacement four cylinder engines with an almost completely free flowing exhaust are a love it or hate it sound.

However, I stress again that this is illegal to do, unless you plan to operate the vehicle off public roads only, such as on a race track or for off road use. If you want to increase the performance, it’s best to do some research and decide which exhaust system and high performance catalytic converter would work best for your vehicle, and go with those parts.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. What happens if i replace the catalytic with a thrush muffler and put a DC sports exhaust about 2 feet away from the thrush.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Our 1991 Nissan Maxima shakes violently when first starting, moving slowly, or stopped, it accellerates slowly now as well.

Hi there. It's quite common for shaking to occur after completing multiple fuel system component replacements, typically due to a vacuum line being disconnected accidentally or being loose. In most cases, the symptoms you are describing are due to a...

Q: I have a diesel car. Can I remove my muffler?

Hi there. Depending on your state that you live in and the emissions requirements, removing the muffler may cause your vehicle to fail emissions. Plus, on a newer vehicle that has a manufactures warranty, removing the muffler completely can void...

Q: What Types of Metals Are Used to Make Exhaust Systems?

Chances are good that your exhaust system is made from 400-series steel. Cast iron is used for the exhaust manifold (stock). Aluminized steel is often used in aftermarket exhaust systems. In addition, a wide range of other metals can be...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...