I built a 3.5" custom ram intake this weekend however I'm noticing a loud vibration which could possibly be my air filter hitting the felt liner on the bottom of the hood. This only seems to happen when I rev over 6k rpm. I used an old k&n fipk air box and think I might be able to make more room by cutting a slightly larger hole to allow the intake to ride lower.

Will this be a long term problem if the filter continues to hit the liner or could I put some padding on the liner to reduce the vibration?

Or does anyone have a suggestion for a lower profile filter cone? I'm using a 6" AEM filter.

I am using the K&N airbox for mine as well. The Filter sits about level with the top of the box. I did modify the elbow bracket that held the K&N intake arm to fit the 3.5" intake. I do not have rubbing issues, I also do not have the hood liner installed.

I don't have an image straight on from the front of the car, but you can get a feel for what is happening from this photo.

Attachment 84934

Your still on factory Throttle body? doesn't that defeat the purpose?

Everything in due time. I wish I had enough time and money to do everything at once.

Which elbow bracket did you modify and how? Which filter are you using?

I had gains with this on stock throttle body.

The elbow is in this picture with the hose clamp on the K&N intake arm by the airbox, I had to elongate the mounting hole to allow it to sit lower.

Attachment 84932

Mounting hole elongated:

Attachment 84933


My parts list is provided by another member (page 4 of this thread), following in his footprints:


Thanks for the info. :tipwink:

does anyone have the dimensions on the fipk fox portion alone so that someone could remake it to use with bigger piping

Did you dyno this intake? Before and after...

Not yet. When I do it will only be a calculated one from data logs, since I live in the middle of nowhere and don't care to drive 6-8 hours to get a number.