Check out Maddad Whisper. I have the Street Series and love it, but it might be a little loud for a daily-driver. Sounds comparable to the PE (nice sound, not too loud, no drone), but for just a little more than the Magnaflow.
Cheers,
Bryan
PS> In fact, the Maddad would be very little extra money as it's currently on sale.
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2011 135i M Sport | COBB V3 AP Stage 1+ | ER FMIC and CP | BMS OCC | Dinan Stage 3 Suspension | Dinan High Performance Bushing Kit | M3 Wishbones | Modified CDV | Clutch Stop | APEX EC-7 Wheels w/ Michelin PSS 235/40R18 265/35R18 Tires | Maddad Street Series Exhaust | BMW Performance Kidney Grills | LCI Blacklines | Armrest Delete | Spoiler Delete | 28% Tint
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