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400M -> RE: Need a honest answer - cats or no cats (12/24/2007 6:17:02 AM)
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On that vehicle, you probably won't see the gains in fuel mileage that you're looking for by removing the cats. You CAN see improved performance numbers, but the gains in economy will be minimal, if any. My brother-in-law calibrates these things for a living and says that on newer Ford vehicles, they tend to richen up with the cats removed...to where they'll make more power...but use more fuel to do so. You're also very likely to set a "Check Engine" light if retaining stock downstream HEGOs, but if the "dummy" ones are employed to send an "all good" reading back to the processor, you may get around that.
Still, in answer to your question...you probably won't notice much, if any improvement in fuel economy with the cats removed...and it can in fact be WORSE than before, although the trade-off being it will make a little more power.
It's your call!
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