A Few Dual Exhaust System Questions...

[morgan-tec]

The exhaust recirculation is common in pretty much any suv but not really a concern in my book. Since the rear window does not open i would not even worry about it. As for the pipes you will never feel the difference in smooth bent pipes vs. mandrel. You would be really hard pressed to see a diffference on the dyno as well.

[Joe_Black]

There are vents located around the perimeter of the rear door that allow for the exchange of inside air, so it is a legitimate concern. When a significant level of CO builds up you won't smell it, you'll just go unconscious.