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My 2006 Coupe came with an AGM - I guess some of the model year 2006 Roadsters did not (IIRC the one in the car is 550 CCA)? In or around 2010 BMW NA/Canada upgraded the standard offering due to warranty claims to an Exide AGM (Italy) with 800 CCA for just about the entire model range (I have one in the garage on a float charger).
The Exide folks presented to us a couple of months ago the move to AGM as the premium offering due to it's cycling ability over lead acid and the demands new vehicles put on batteries due to electronic devices and options like powered mini van sliding doors.
You'll see AGM batteries as the premium offering at CT over the next week.
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2006 Z4MC - #LL93158
SS Race Cans, RE X Pipe, DKF Sec 1, Fabspeed Headers, OE STB, AS Shifter, Dave Z CDV, GC Coil Overs, Stoptech lines, Hawk DTC Pads, RE Clutch Stop, RE Transmission Mounts, Vibra-Technics Engine Mounts, Poly FCAB & RTAB, LeatherZ M Shift Boot, Tekarbon Rear Spoiler, CF Grills, Advan RS DGM
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