Hey, are you sure the mid pipe isn't installed backwards?

I remember I did that with my T1R exhaust, and as you said, it would make a very loud and annoying sound through the mid range. Might want to check it out.

 

Thanks for the info. Perrin's mid pipe can only go one direction. It uses two bolts to connect to the stock cat and a v-clamp on the other side.

 

I received a resonator from Perrin and had an exhaust shop weld it with the mid-pipe. It greatly reduced the vibration. Thanks to the good tech support from Perrin!

I still hear some vibration sound once in awhile if I turn off the radio. I am debating if I should get a 2nd resonator? Or am I being too picky?

The tech support at Perrin told me that I was the first one to have exhaust drone with their products. However, the sales guy at GST told me that every aftermarket exhaust droned and the only way to get rid of the drone was to putting stock exhaust back. Their opinions are so night and day apart!