I'm going to replace the speakers in my 300E
what's better to use and why????

Infinity Refrence, or the Kappa ?
going to do the 4 1/2" in front and the 5 1/4" in back

are either ones a streight drop in or what?

any feed back is needed.

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1987 300E owner

The Kappa is MUCH better. If you're planning to fit 5 1/4 in the back, you'll need to get a bit creative. It is NOT a "drop in" fit. I'm not too sure if 4 1/2 will fit in the front dash either.