Originally Posted by BoilerUpXFire

Capacitors, lets say a 5 farad, which would be more than enough for your current system or anything you want to upgrade to that would fit in a XF are like $100 on fleabay and will greatly reduce the strain on your OEM alternater. Lets consider the alternate, a new, larger alternater or getting yours double spun, either option is minimum 5x the cost of the capacitor. Get the cheap insurance because if you continue to drive it the way it is, you are going to lose an alternater and that will be a lot more than the capacitor.

Just my $0.02