So I was out logging in my 03 Cobra tonight. I turn this corner and had to keep it in first gear so I can hold 4000 rpms without speeding to check and make sure the mass air gets dialed in. All of a sudden I hear this high pitched noise in the back ground. Look in my side mirror and all I can see if head lights, fog lights and this truck hauling ass from behind. It was my buddy Randy/ Randy5.0. Twined trucks sound awesome! Never heard one coming up from behind like that before! Hearing mine from inside the cab is nothing like hearing one as it comes at you! Thats one sound I would never get tired of hearing!