YES YOU CAN HEAR THE SOUND DIFFERENT'S AND YOU CAN ALSO SEE MORE EXHAUST POUR OUT OF THE PIPES. YOU CAN TEST THIS OUT BY PLUGGING THE ORIGINAL TUBE BACK INTO THE FLAPPER VALVE WHILE THE CAR IS RUNNING AND IMMEDIATELY YOU CAN HEAR THE FLAPPER SHUT AND EXHAUST IS SUPPRESSED. I USED A SIMPLE ZIP TIE TO KEEP THINGS TIDY.
