ZDDP is a common additive to increase pressure resistance in oils. It has been tied to killing cats, although the kind of cat-killing this does is much worse on a car that consumes a lot of oil (namely rebuilt, low tolerance motors, not OEM equipment).
Either way, if you plan to TT in the future, it won't matter. You'll just be running nice fat test pipes instead.
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-Phil
"Since one of my brake light bulbs just went out, the forum told me that my piston rings are about to blow."
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