Speakers for my 06 bmw 325i

Pretty sure BMW's have stock 3-way on the newer ones.

If the speakers are anything like they were in my friends '03 530i, you don't need to change them. If anything I'd get an external processor to X-over the speakers higher, then put in a nice low-end stage, nothing too big or fancy and have that cover the lows. The only problem I found with my friends BMW was that the speakers tried to do frequencies below like 60hz, and it didn't work out too well. Ended up sounding hollow.

Ok what is an external procesor?? Is that a head unit?I gotta admit the stock speakers are prerry darn good

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No. Not exactly. More like a cross-over. In order to do this, you'd have to externally amp the speakers. Which could prove costly. You could just completely ignore that, splice into your harness and use a LOC (which is actually a high output converter, not low.)

The only problem with that idea is that your speakers and subs might be playing the same frequency and thus have cancellation issues.