of course it is because you are drawing cold air from outside the engine bay and cooler denser air give more power, the only down side is the possiblity of drawing water into the engine (hydrolock) but you would have to drive into a pond for the to happen
Very well made except for the MAF screws I just used the factory screws. couple that with a tune from focus-power.com or hypillauto.com and a 65mm Throttlebody and the SVT is a good performing vehicle.
the stock SVT snorkel is not really ram air when there is a lip infront of it stopping the air from directly entering the airbox.
I just installed my Cool-Flo Intake in mine lastnight. If I had a deep well 6 point socket it would have taken me 10 minutes but I am going to have to wait because I couldn't get the tranny mount bolts loose.
The cool Flo may not be the best but I got it cheap off of sleestak. The thing sounds AWESOME now! I am not sure if there is any real performance gain, I might just be imagineing it because of the sound but it does seem like it's a bit stronger...