I just installed my RK-3934 air intake. It took about an hour, I "You Tubed" it and followed the enclosed directions. The increased airflow seems to help a little with deceleration popping I got going on but there's enough left to give me reason to buy a FP3. When I originally received the intake, the chrome cover had a scratch on it. A simple call to K&N got a replacement cover on its way and to my door in two days! Awesome customer service. I went with this style for clean and nostalgic look of it. Between the oil tank and intake cover there is a lot of shiny metal! I went with 3934 because to me it has a clean and nostalgic look.