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I was curious about this similar issue.
I ordered a Dinan rear muffler and am still considering tune... (even more so now that I discovered 15% off sale from Dinan thru 12/31/12) but, want to make sure that the two combined will not cause a problem with CA smog.
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| 2011.75 M3 Sedan | Le Mans Blue | M-DCT | ZC2 | ZCP | ZP3 | Moonroof | Enhanced Premium Sound | Dinan free flow exhaust | Dinan performance engine software | Dinan underdrive pulley | Dinan intake | Dinan pedals | Bimmian Ultimate LED interior | Lux H8 V3 | WeissLicht PY24W LED | 20% tint | IND reflectors | IND front grills | IND key hole cover | IND hood vents | IND M5 mirror covers | Reus Systems audio upgrade | Verstraβe shifter paddles |
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