Batteries.
Most of the cars in Spec Boxster run an Odyssey Extreme battery. They work great and weigh quite a bit less than a standard full size battery.
Well, they work great until they don't. Everything will be fine and then the battery will be dead as a doornail without any warning or hint of running down. This has happened twice - one time at the track and Brad Roberts had to R/R the battery in 5 mins with me suited up in the car so I could make a race.
The last thing that I need is more stress or something else to worry about at the track. So, now I treat the battery as a standard maintenance item and replace it every 12-18 months (around $150).
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