The Key to the MONSTER Setup is the AWESOME appearance of ONE CONTINUOUS exhaust stack. Our Monster Range, including our popular "Aussie Curve Truck Exhaust" have SEAMLESS INTERLOCKING, achieved through a special Reduced End called a TAPERLOC. The TAPERLOC end is on both the CENTRE SPOOL and the ELBOW and enables ANY TOP STACK to slip onto the SPOOL and thus the SPOOL to slip onto the ELBOW. These two joints are then hidden with a WIDE CLAMP.