When my car is in OD it kinda feels and sounds like it's missing. It's not a smooth exhaust tone until you get on it, but crusing it just sounds funny, almost like struggling. I drive around city in D and it doesn't do it then. What do you guys think it could be? It's kind of hard to explain. To recap, it's a smooth sounding exhaust tone in D and when opening it up on the highway in OD, but just cruising in OD it's like a struggling exhaust sound, like a miss or exhaust leak.