Quote:
Originally Posted by berty987
The 987 has two sets of catalysts however the 986 only requires one , so the first thing to do would be decat the manifolds and free up a bit more power.
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Only 97-99 models have one pair of cats. 2000-2004 models have 2 pairs of cats (total of 4).
Might as well go aftermarket with the amount of work involved.