I have seen 8-12 whp gains on the dyno before from a basically stock Z before depends. Installing high flow catalytic converters is worth it you will see whp gains from it. I would install the AAM Competition high flow catalytic converters with your muffler delete over the Invidia high flow catalytic converters. The AAM Competition high flow catalytic converters I installed before had excellent fitment,were excellent quality,and lasted a long time until I sold them.
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