hi, i have a 98 civic ex coupe d16y8, i installed a short ram intake, with k&n filter in it, but the filter is making a high pitchy sound. i used to have one on my d16y7, but it didn't make a sound like this. the sound is so low that i can even hear it inside the car, it sounds like i am at high rpm. is this normal, or is there a leak somewhere?

also i have a half cat back exhast from the resonator to the back, when i am right at 3000rpm, somewhere around the resonator is making a vibrating sound, does anyone know what that is? it was ok before i had the exhast on.

thx!!