Drag Racing Tech - Anyone notice a drop in et with poly torque arm bushing?

Just wondering, I seemed to knock off a tenth with my last two Z's and I'm getting ready to put another on my latest Z. Think it's a well spent $15.

yes I do! 1.67 on Nittos and m6,I have not updated my sig yet

Is there any added vibration associated with this mod?
-Josh

I believe the last one I had did a little bit. Then again, I've always gained some sound from the shifter. I haven't put it in yet. I've also heard a lot of people don't put aftermarket torque arms on unless they are running like 10's or better.