I recently had a set of "Detroit Rockers" installed on my 2005 GT. I knew what to expect regarding the idol, but wasn't sure what to expect beyond that. What I'm talking about is being able to feel the car shake sitting at a stop light, or even in park sitting still. I popped the hood and can see the engine shake a little. This by far is not an aggressive cam, but my question to all of you out there is, is this normal behavior for having cams.