performance, well, using just the glasspk, NO. Now, using the flowmaster, yes, there was a noticable difference in performance. The car seems to be lighter on the accelerator pedal which I guess means because of a less restrictive muffler than the stock one.
I need to agree with Wutang about the sound ( how loud it is ) of the Flowmaster. That is why I had to put a long glasspk to quite it down, but at the same time, do not take away the slight performance advantage of the muffler too.
As far as Dynomax, mufflers, That was actually my second choice. Borla, ****, to pricy .I will have to admit that Borla's are the best, no way around that!