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What year is your car?
I have seen many 2.7's and newer remove the 1st set of cats with no problems.
As far as 2.5's go we only have one set of cats and there is at least one car on the board who removed his only set of cats from the 2.5 but had his ecu remapped.
If you have a 2.5 please post your results after you removed the cats.
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