cuting off cats

jberge07 · Feb 7, 2009

hey I have a 03 4.0. I'm debating to put a new Exhaust system. With new headers and a flowmaster super 44. I don't know if i should cut off all the cats or gust put the new Exhaust behind them? what happens when i cut them off other then my check engine light comes on?

KELLY88 · Feb 7, 2009

Cutting out the catalytic converters can cause a number of problems. Throws your O2 sensor readings off (cause of the CEL) which also reduces your gas mileage. It's also a lot louder and makes the cab resonate in a very annoying way. Plus to top it all of it's not emissiosns legal anymore. Leave the cats in, do a catback system and you'll be perfectly happy.

jberge07 · Feb 7, 2009

who makes a good system

pillen140 · Feb 7, 2009

jberge07 said:
who makes a good system

there is a bad ass dual system from lmc truck. or look in jegs mag, or summit.

93FordGuy · Feb 7, 2009

If I was you I think I would go with a 50 series flowmaster, I have a 40 and its loud, and sounds crappy. Doesnt sound bad when you first start it up and at idle.

cr_the_machinist · Feb 7, 2009

I like my Dynomax Cat-Back. It's just a single in and out with 2.25~2.5" pipe. It's not loud but it makes it purr pretty good. Best of all its under $200! I've had it on my truck for a year and a half with no compaints.

okietheranger · Feb 7, 2009

93FordGuy said:
If I was you I think I would go with a 50 series flowmaster, I have a 40 and its loud, and sounds crappy. Doesnt sound bad when you first start it up and at idle.

i have a 40 series i happan to like it, even got it on my mustang

cuting off cats

jberge07

10+ Year Member

KELLY88

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jberge07

10+ Year Member

pillen140

15+ Year Member

93FordGuy

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cr_the_machinist

15+ Year Member

okietheranger

15+ Year Member

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