If you're not running the bypass plumbed in recirculation mode, a filter does help quiet down the noise. Note: it only quiets it, its still very noticeable.
I agree with Chris, the filter does act as a slight restriction but I was also using a very small filter. I'm sure if I spent more time plumbing the space for a bigger one, it would not be such a big deal.
I'm using a Procharger Big red recirc. bypass, without the recirc hose connected. If I had to do over, I'd have the discharge face up towards the hood instead of down towards the ground because it kicks up a LOT of dirt and dust even at idle which makes it impossible to keep the car clean.
John
I agree with Chris, the filter does act as a slight restriction but I was also using a very small filter. I'm sure if I spent more time plumbing the space for a bigger one, it would not be such a big deal.
I'm using a Procharger Big red recirc. bypass, without the recirc hose connected. If I had to do over, I'd have the discharge face up towards the hood instead of down towards the ground because it kicks up a LOT of dirt and dust even at idle which makes it impossible to keep the car clean.
John