Nah didn't get a chance to drop it, we only put a sensor in the rear dump pipe and on 16psi it had 6psi back pressure then went home punched cat out then put the sensor back in and went for a drive around and on 14psi and didn't go over 2.5psi back pressure Then on 18psi it hit 9psi in 2nd gear
does it matter what gear your in? Or am I doing anything wrong when testing it?