Installed a Fabspeed Maxflo Muffler, 200 cells cats, and a X51 factory header. I have had the system on for about 4 days and made one 200 mile round trip. The system sounds great! Louder than stock, but not too loud. Quiet on the highway with no resonance.

The performance seems a little quicker, but it may be that the louder muffler is just giving the illusion of more speed. I did have some old 75 to 100mph times in 6th gear and those are identical, although wind and other factors can make a difference and I don't remember the exact conditions of the first times.

I bought it for the sound and I am very please with it so far!

 

Right side tips are crooked.

 

Make sure you disconnected battery for 10-15min to reset ECU prior to driving on this new setup so ECU could re-learn faster.