The unmistakable slash cut ends on this exhaust system makes it different from the regular Shortshots. The deep hot rod roar shows everybody there is more to this system than good looks. Stepped headers from 1 3/4" to a 2 1/2" muffler body and 220° coverage heat shields that are almost invisible. Note: Comes with 18mm O2 threads. A 18mm sensor-hole plug set, like 981623, is not included and must be ordered separately when O2 sensors are not used.