So, in playing w/ my exhaust (I have kooks long tubes as well as the kooks catted mid pipe) i took off my stock mufflers today. So i'm basically running headers > cats > x-pipe and done. Just wanted to see what it sounded like (thinking of getting the solo axle backs). It sounds good, but there's a lot of backfire/popping going on when i let off the gas. is this normal/is there any danger to this?