My damn apex-i duel exhaust is off the hanger on the left side. popped it in while doin oil change it's off the hanger right next day and the sound of the car changed too ****

 

changed to ****? one of the gaskets not sealing correctly maybe?

 

It should stay on w/o a problem. If the sound changed, something probably isn't sealing right as sporff suggested. There shouldn't be pressure on it while it's in the hangars, it should sit in there nicely. If you have to force it in, maybe try taking it to a muffler shop to rebend the brackets?