Hi!

I just installed a pair of Pioneer 4" speakers up front. Very easy swap.

The rears, I opted for a pair of Pioneer 6.5" speakers. (I know Pioneers are generic speakers, but don't matter.. they sound a lot better than the stock speakers)
The Pioneers aren't very thick so they do fit. Just make sure you don't get those very thick 6.5" speakers...

took me a while to cut out the rear deck.
Other than that.. it was a pretty easy job.

Cheers,
-Holson-

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2008 BMW 335i Coupe