well depends on how you define good. What kind of music do you listen to? You like alot of bass and treble? If so then good no.....
As far as replacing them i know little about the Mach460 so I dont know what all is required to swap them out. I would assume you wouldnt want the 2 1/2 inch speaker still connected if you put new 5x7's in replace of the old ones but I am not sure on that.
Go to www.crutchfield.com and put in your car info and it will tell you all you need to know about the speakers you can replace and what brands they have.
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