My new dynomax ultra flos came and I swapped out my flowmaster 40 series for just one of the ultra flos and I think I experienced a loss in power. Is there an inlet and outlet on the ultra flos. I thought it was a straight shot muffler and it didnt matter. I also put on the driver side lx tailpipe. It just seems that my third to fourth is a little doggy. Anyone have any ideas?