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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Re: cutting off the cat and muffler
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!
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When you start talking about catalytic converters it become a nightmarish issue, plus a huge legal one as well. Federal emissions laws state that all motor vehicles built after a certain date pass the federal emissions standards. I can't remember the year exactly but it was in the late 70's in believe. Long story short. You can't just cut it off and then put a straight pipe back in its place. Plus it has O2 sensors either on the upstream or downstream side. Depending a few factors. Check to see how much exhaust is coming out of the tail pipe (restrictions or clogged). Whatever you do? Do NOT try and cool it down when it's that hot. It will cause all the combs inside to break away or shatter (implode) inside the cat and all the internal pieces will clog the muffler up. Then you will need a new cat and muffler. But it sounds like its diffidently and restriction problem. For example; what goes in the engine, must come out. There could be other issue as well but not nearly as likely. The other possibilities are fuel related or you are just running the he11 out of it. I'm sure any local muffler shop could diagnose it very easily. And I'm sure they wouldn't be nearly as expensive as a repair shop or dealership. Hope it helps.
Sounds more like an ignition misfire. Sometimes also, an exhaust leak in the pipe above the sensor can add enough air to cause the mixture in the pipe to ignite and cause the same problem. The first "weak point" in the exhaust is the muffler which is why it blows it up. Cutting out the cat will not solve this.
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
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.