Thanks guys for the quick responce, I got the answer, I called mac and also a few preformance shops that deal in mustangs and they all said the same thing you need the mil eliminators.
The 2K mustangs have four cats and four o2 sensors, the prochamber comes with a hole for each. However, the cars computer is not sensing a difference in the o2 gases as they pass from the first set of cats to the second set thus causing the lite to come on.
The one draw back is that there's a two week wait on the parts according to dallas mustang.
The second thing is the cars performance is handicapped to some degree until this problem is fitted due to the computer trying to make the right adjustments.
I'll just drive it carefully until the mil eliminators come in, then its back to eating some more of those slow a--chevys......
regards 00-525
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