I had both a cutout at one point and now the loud mouth, the cutout was louder and sounded a little meaner in my opinion. But the cutout for some reason caused the interior to vibrate. The loudmouth is almost as loud, sounds good, and but dosent roughen the ride up like the cutout...

A cutout is a good +6 hp mod though for the money.. I dynoed an extra 6hp and some extra torque over the flowmaster american thunder catback. I hav awhole new system now though, and im more happy with it.