Question about 1997 Ford F150 Regular Cab

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Cutting off the cat and muffler

I bought a 1997 ford f150 with 5.4 motor. The previous owner has cut off the cat and muffler just running straight pipes. Will this cause any problems to my motor? We have no emissions testing in my county so im not worried about passing a test to get my tags.

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  • lawrence_wis Feb 03, 2009

    Thanks scary.....



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It will not Hurt anything. It is the First thing that I do whenever I buy a New Truck. It Increases Horsepower and Mileage + Sounds Really good with Flowmasters. Nothing to Worry about. I have NEVER had a Problem doing this. Please Rate My Response! Thanks!

Posted on Feb 03, 2009

  • Travis Humphries
    Travis Humphries Feb 03, 2009

    No Problem Bro! Happy To Help!



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96 grande cherokee 6cyl. replaced o2 sensor and code still shows bad sensor so changed out again thinkjhg it was faulty but code still shows bad sensor.Drove for while and back fires to the point were...

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yes you will need both cats to pass depending on where you are. i have had 3 broncos and im drivng one now and cut one off and have the muffler and one cat and it passed. as long as your not in california i think you will be fine with just one

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Good Day,

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.

Good Luck

Hope this helps.

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