Update: I installed Berk Test pipes, along with an ARK exhaust and Injen intakes. There is in fact a hiss after 3500 or 4000 rpm...my friend jokes about it as my "ghetto turbo".
You really don't even notice it. It is just another "race-car" noise, like the whining of the transmission or the shifting after adding solid bearings, etc. You get used to the smell and noise...I suggest getting the HFCs if you are bothered by that smell. The actual process of installing them was fairly straightforward...annoying though.
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