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Is your alternator stock? If it is it should be able to power the system fine as long as all your connections are clean [specifically grounds at the amp[s] and in the engine bay] Matt runs a pretty high watt system on a stock alternator I believe
12-14 gauge wire is fine for speakers, I just bought some electrical wire from home depot, helps to pick something out where each wire is colored differently.
You can fit 6 1/2's in those brackets, what you get is all about budget, I bought Polk's, the line I bought looks to have been discontinued but would probably be comparible to the mm651's but in the 5 1/4 size. Sound pretty good, tweeters might be a little bright for some tastes
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