I heard back from Berk. The *Hiss* is in fact normal. You will get this when using the HFC or Test Pipes. I thought it was normal but thought I would ask just to make sure I didn't do something wrong during the install.
They gave me a couple of tips regarding the small fitment issue I'm having. I am going to take the hanger bracket off, reinstall it in the factory location using the tips Berk gave me and test it for a few kilometres and see if things stay put.
Otherwise the exhaust is kickass!
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