Here is a link for the MSD filter cap being sold by summit: http://www.summitracing.com/parts/msd-8830?seid=srese1&gclid=CNSg5a3Ky7kCFYs1QgodM3AAyw The MSD price seems a little steep. However on ebay I found a 29,000uf, 25V capacitor for about $6 that would do the job. It is 2 inches in diameter by 4 inches long. See: http://www.ebay.com/itm/MALLORY-CAP...ultDomain_0&hash=item257d7956eb#ht_1776wt_913 Do not go any bigger on the capacitors as the inrush charging current can blow fuses. Mounting the capacitors can be a pain. I try to use tie wraps and if there is nothing to tie them to, screw down small length of aluminum angle stock with tie wraps under it and wrap them around the cap to hold it against the aluminum. If you look at the engine compartment photo of my car in my profile here on the forum you will see the grey capacitor mounted with tie wraps just to the left of the MSD ignition box.