Just had the Stratmoshpere F1 installed on my 2006. Wow! Certainly makes some difference in the feel of the car. Yes, it does seem to pull better - more power - and the sound is excellent. There's a definite visceral sense of more flow through a larger pipe.

With the CAI, 15% Pulley, DT Bypass Valve and now the Cat-back, the car really feels like a high-performance vehicle. I think the next thing is a rear sway-bar.

But it also added considerable vibration at lower revs, like around 2k that can be felt in the cabin. As the car accelerates there is more general vibration at different RPM points. It's not unpleasant, but I'm wondering have any of you have had similar experiences with your Cat-back systems?

I got a great deal from John and Frank at Stratmosphere. Very friendly, and put up with all my calls and questions, too.

I'd check the installation: your exhaust might be vibrating against the car (check the front hangers). You shouldn't feel significantly more vibrations.

No extra vibrations here with my Stratmosphere on my '06. I echo Helix's post above.

Thanks for the replies. I'm going to have it checked on Monday. Frank at Stratmosphere said the same - something is making "hard contact" creating the vibrations.