DSRTRDR

running the pipe straight back will pull all the exhaust right back in - it HAS to go out behind the rear tire don't ask me how I know :rolleyes: [also, the closer the exhaust comes out behind the tire, the more hassle the emissions guys will...

have you looked at the adjustment of your steering stops ? - tire rubbing may give a rhythmic sound [I call that "pseudo-birf" - mostly encountered in downhill steering on my 40] adjusting the steering stop to keep the tire more inside might help