Plugs, Alternator, Battery?

[AvonStang]

So, I dont know what I've got in my car for plugs, but I'm sure they're nothing special. I've seen ads for like "performance plugs" what kind of gains can you expect to see just from more expensive plugs?

Also, I bought a new alternator for my car last summer as my old one was shot. And since I've seen ads for high-output alternators, what's the story there? What difference do they make?

Same with batteries?

Thanks.

 

[MaximumRisk]

As far as spark plugs go, unless you have forced induction (turbo, supercharger) do not bother going to a "high end plug" you will not notice much, if any, change in performance.
High output alternators put out more amps and the same rpm's than a stock unit.
They are a good idea if you are running a lot of electrical components, such as multiple amplifiers, huge speakers, etc, etc. Otherwise your stock/ stock replacement is more than enough. Same goes for the batteries, Optima batteries are supposed to hold up better to electrical demands than a stock battery, but they seem to be hit or miss as of late. I have read of a lot of people having problems with them lately, probably poor quality control as of late.