I was thinking about doing a full exhaust system. When i saw this m4 gp full I really liked the positioning of the muffler. But i want to put a pcv and an autotune on also. Looking to see if anybody out there has this system on their bikes, if it has an oxygen sensor bung and if they like the sound from stage 1 baffle or if stage 2 is better. I like to sneak home early in morning sometimes and would not want certain people to hear me coming. Also doing [email protected] filter. I was interested in the numbers that i would come up with for that setup. If anybody is running this pipe, let me know. I'd like to go -1+2 also for extra kick in the ass.