I was driving around and i heard a pop. After the pop my exhaust sounded like a jappanese tuner. I took a look at it and 2 of the pipes were disconnected.I reconnected them and it got rid of it mostly but u can still kinda hear it. THe wierd thing is, is when i get past 3*rpm it goes back to how it used to sound. What im asking is should i get a whole new exhaust system or not