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I think my opinion is kinda shady with the "test pipes" issue because of the setup I came from and the difference between that and the same setup but with test pipes. The Hi Power Ti sounded great with stock cats and headers...really great. Then I threw the test pipes on there and the sound difference was so drastic. It wasn't long after that, that I got rid of my Z. I had a few NA goodies done to it and still had a set of SFR headers on the shelf in the garage that I wanted to throw on there also. Oh well, I guess.
Hind-sight being 20/20...I should have left all the NA drama for yo mamas and just went with a TN ST kit and called it a day. I believe I'd still have my Z today if I had done that.