A before and after comparison of sound levels from ERZ hfc's on a 370Z measured at 10 feet behind the car and 2 feet above ground level using a Radio Shack meter.
On the A weighted scale at idle: stock=54db, ERZ hfc's=57db
On the C weighted scale at idle: stock=72db, ERZ hfc's=77db
The next measurement was done by momentarily going to wide open throttle.
On the A weighted scale at WOT: stock=84db, ERZ hfc's=87db
On the C weighted scale at WOT: stock=93db, ERZ hfc's=94db
The bottom line is, that it is not much louder with just hfc's and everything else stock.
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