Yes, understood the increased demand of the new automobiles on the battery. I suspect a drain on the battery and low voltage has caused damage to modules. Non the less the Vartas batteries that came with the Crossfire from the factory lasted much longer than those available now as replacements.
In reference to the 74mm: It is an upgrade that you can easily do yourself. To take full advantage of the greater air flow through the throttle body I also have installed a matching 74 mm MAF housing and Needswings cold air intake. The 74mm throttle body came from a M113 Mercedes engine. Click on the following link for more information 74mm upgrade