Been experiencing a ton of issues lately. I have 2010 Mustang Shelby gt500 with 649 RWHP, tuned for 93 octane gas. Filled with 93 octane gas, and when excellerating the supercharger whine is not as pronounced as it once was and on the downshift to slow down I am getting 1 or 2 back fires in each gear on the way down to 2nd. Not all the time but 80% of the time. Noticing a lot of white particles around Magnaflow muffler tips and along the back side of the black bumper. Seems like a slight loss of power as well.

Any feedback would be appreciated. I only have 4010 km on it, yes 4010km. I have thought about using sea foam. I had blown a spark plug and 2 were replaced but I wish all of them would have been replaced. Not sure what to do.


Thanks in advance.

 

I was hoping for some help.... I guess its a tough one. I am not sure if an exhaust leak would cause this problem.

 

You can start your car and cup your hand over the tailpipe. If your exhaust has a leak you will hear it whistle where it is leaking. I dont believe that an exhaust leak is your problem. I don't know enough to help any further.