Welcome to TGC, So first of all....
1.You dont have to replace stock speakers but its gonna sound terrible if you dont.
2. If u replace speakers u dont need new H.U but u wont have much difference if u keep it stock.( Its better to get new H.U for ur Sub an amp anyways.)
3. An amp for ur aftermarket speakers would make everything sound much better.
4. U only have 4 stock spots for speakers in ur G, but u can easily change that.
5. Ur best route is gonna depend on how much money u wanna spend an search the internet for good deals.
6 & 7. Differnence is 1,2,3,and 4-way speakers are a 2 way will typically have a small woofer cone an some type of tweeter an a 4-way will have small cone with 3 tweeters on it (Bassically) an a 3-way would have small cone with 2 tweeters...
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