Removing the stock cats for high flows or resonated test pipes is one of the best mods you can go with for the Z. That paired with a plenum is a great combo. It doesnt really hurt the car in anyway. Very worth it cost wise as it can easily be done for under $400
I did it and replaced them with straight test pipes. Nothing wrong so far, and my butt dyno really feels the punch in the higher rpm's. Like Dave said, it's a great way to improve the performance of the Z.
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