Upgrading the rest of the electrical system would be much more beneficial to you. Replacing your alternator with a high output version and a larger battery plus upgrading your engine wiring. Battery to Alternator, Battery Ground, Engine Ground and Battery to underhood fusebox will also help and/or cure your issue. Capacitors are a band-aid on a broken leg kinda fix. The average cap takes five times as long to charge as it does to discharge therefore, the majority of the time your cap is in the car is spent charging and not helping. They are however good at smoothing out ac ripple from your alternator that makes it past the battery. This ac ripple generally is the cause of hard to find engine noise.
__________________
MECP Master Certified Installation Technician
Don't worry I've never done this before
|