I have run my system, which is around 900 watts, for years on a stock elect system, but have had a 5F cap, and never had even a hint of problems
on any front (Not even a blown fuse!). Unfortuantely there is increasing evidence that there is a lot of crap in the under $100 cap market, esp at
under $50 (no matter what the package may say).
So unless you sit in your car for hours listening, where your running on your battery, then a cap can be a very good solution, esp if you want
your bass to really hammer. IMHO.
Rick