Does the Stillen SS Exhaust live up to the stated HP and torque gains?

Now choose from 2 tip styles on 350Z exhaust! This is our long awaited big tip on STILLEN industry leading exhaust for the 350Z. Made of 100% stainless steel, the system features dual pipes and mufflers and a lifetime warrantee. It makes the most power of any 350Z system on the market and fits like a glove. Retested on 9/11/03 in 5th gear dyno runs to add 16 HP at 5600 rpm and 14 Ft/Lbs at 4600 rpm. This is the first and best full cat back system available for the 350Z. The fit, finish, power and mellow tone have to be experienced to be fully appreciated. No other system available can compare! Please note, ships in two boxes. Call for a more accurate shipping quote!

As for sound and loudness, how does this system compare to Borla??