Headphones recommended. Why? Because otherwise, you don't feel the bass rumble like you do in real life.

In park, you feel the rumble a little bit. In gear at a stoplight? This cam shakes the car; if it were a Shaker Challenger, it would truly be a Shaker! It truly brings back the original sound and feel of Old School Muscle. The engine shakes, the body shakes; this cam wants to GO!