Does anyone know what type of muffler is installed on the I4 model? It looks to be the same type as the Focus, sort of that flattened Tylenol looking thing with two outlets, but has anyone ever seen the insides of this type. Is it a reflective type, absorbtion or some other strange configuration. The stock resonator is a Helmholtz type which spells major backpressure due to the design, much like a Flowmaster but I can't seem to find anything about the Muffler. Just give me a V-8 and a glasspack !!