having invidia exhaust and berk HFC's, I can comment that at cruising speeds it is hardly noticeable. You CAN hear it, but barely, and it's definitely not intrusive. If you give it gas at 65 mph in 6th gear, you get a little drone, but it's not bad at all. Under WOT it sounds awesome, I love the way it sounds when I get on it. The problem is the small rpm-range that has a drone when daily driving, which is there on MOST exhausts.
I can't comment much on the stillen vs FI, as I've only heard mine, nismo, and Berk recently. For Quality I would say FI hands-down.
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____________________ PROJECT DiaD - Sold but not forgotten!
The first testicular guard, the "Cup," was used in Hockey in 1874 and the first helmet was used in 1974. That means it only took 100 years for men to realize that in order to work the penis, the brain must remain whole.
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