From my personal experience in terms of loudness and drone.
1. Stock system
2. AA Headers with stock secondaries and stock exhaust - Slightly louder and hard to tell it has headers from just sound. Tame
3. AA Headers with stock secondaries and MagnaFlow Catback - What I have and I think it's perfect. MagnaFlow also includes its own resonator. Sounds kind of like my old E46 M3.
4. Stock exhaust with Muffler Delete - I had this for awhile, and it's actually louder than the option I have now listed above.
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