I ask because sometimes at low speeds with the radio off, I hear a slight hissing sound when accelerating. I don't have the carbon traps as the prior owner took them out. Carmax is replacing the intakes with traps next week.
I was on the Ford site building a GT Premium...it says it is an option.
Active Valve Performance Exhaust GT
$1,225S4
Available on GT and GT Premium. Includes Quad Chrome Tailpipe.
The previous owner removed the carbon traps and damaged the tubes. Fortunately, I bought the car from Carmax with a 90-day warranty. They are replacing the air intake tubes with carbon traps next week. I don't need extra HP and didn't want Ford to say I had modifications.