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Update... I went with the Tanabe axle back. Sounds really good with the midpipe. It's pretty quite cruising around and highway driving minimal drone. You can tell it's there. When you get on it, it sounds really good. Not that high pitch sound, a deep growl. I'll try to get a video soon.
I just installed the Invidia midpipe today. I have the Fsport intake - Fsport exhaust - Invidia midpipe trifecta. In the short amount of driving that I've done with the midpipe, I am very impressed with the sound. It is really, really loud at mid range rpm's. However, during normal driving all I hear is the Fsport exhaust.
So far, no regrets...until I need to get a smog check.