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Another update.
While the overall sound with just the header and HFC front pipe was pretty good there was a very annoying, occasional, metallic resonance/harmonic at low speeds/rpm. Going by the general Borla hate blindly parroted on this forum myself and my mechanic expected the cause to be the Borla flex sections or "cheap" HFC Tsudo front pipe. Surprisingly, replacing the OEM over-pipe with a Perrin pipe eliminated this noise entirely. So if you're hearing an annoying metallic resonance from your exhaust, check the over-pipe first. Removing the heat shields may be enough but I didn't try that.
Props to Brady and Pure Automotive for the hookup on the Perrin over-pipe and Perrin silicone intake tube. As always, great work at very fair prices.
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