Yes, the noise is present with HFC's. It is basically the trademark hiss, but eminating from under the car rather than the tailpipe.
I kinda have this theory that it may be escaping through the flex joints. I would like to try welding a straight piece of pipe there instead, but I don't want to chop up my exhaust only to find out that I am wrong.
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2012 Mercedes C63 AMG P31 Sedan, ROW, aFe, Eurocharged Dyno Tune. 438WHP/415WTQ
2010 SOLD: 40th Anniversary 370z
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