Hello,
I have a 06' ford f150 fx4 extended cab 5.4l with flowmaster (dont know if that makes a difference) that has clogged converters. I been doing some research and hear alot about the 94106 and 306 magnaflow but when i go to order them from Amazon they say that # doesnt fit my truck. They have a 99356 but for little more money. Just wondering which # would be the best for me. I have welder and can weld bung for 02 also. Thanks for the help. Id prefer 94306 due to not be as loud.

 

FYI, got oriellys ordering me the 99356hm. Now had a mechanic say i had 4 converters. From what i hear i only meed 2 of these right?

 

I do not see 4 cats, only 2.......nothing but pipe between first 02 and the second se is in the ones on back. Headers are on the other side of the front o2.

 

Well, however many cats you had from the oem, that's how many you have to replace with. As far as mufflers go....I would recommend saving a lot of money & go with Allied resonators......available is any muffler shop nationwide, are of excellent quality, 1/2 the price of “performance Mufflers”, available in any length from 10" to 38" (IIRR), flow as good as Borla, Maggie or most any of the "Race Mufflers”, tone is deeper and you get a nice rumble (low) with no drone and none of the tinny "ricer" echo. Allied has been made for at least 30 years and available in just about any diameter you would require (I have personally run these for since the 1970's....nice low rumble on acceleration & deceloration, no drone, deep tone.

 

I believe the 06 only had 4 converters in California. If you are in California, you can only replace your cats with CARB-approved cats or you will fail smog. I believe a set of CARB cats is about $2500.

If you are not in California, you can replace them with anything, as long as they don't trip a P0420 or P0430 if you have emission inspections.

 

Im in Carolina. I did have a mechanic tell me there were 4 cats, but apparently he wasnt looking under the truck. Thanks for the replies.