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
  • Home
  • Questions
  • 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: Sputtering/not starting when hot?

Hi there: Usually when a vehicle is sputtering and hard to start and accelerate; it's typically an indication of either a vacuum leak, air fuel ratio issues or an obstruction in the fuel flow. Believe it or not, most of...

Q: my 1991 camaro v6 is getting spark and fuel but wont start

If the EGR valve is stuck open or there is a large vacuum leak(s), that could cause the problem you are having. A severe restriction in the exhaust system could cause this issue. You'll also want to check to be...

Q: Muffler smoke after doing repairs on the car

Most likely, the work you had done and the smoke are unrelated. Black exhaust smoke indicates a rich air fuel mixture and can be caused by problems like a leaking fuel injector or faulty engine sensor. White exhaust smoke indicates...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...