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You are gonna need:
1) technique harness
2) great crimping tool
3) butt connectors (lots)
4) a few ring connectors
5) Separate 8 channel DSP
6) separate 8 channel amp
You can sometimes find a DSP & Amp rolled into one, but they will cost you $1000.00 or more. Most likely, the stock logic 7 speakers won't be happy with with any increase in power. That will be a challenge. If you want to upgrade speakers w/ out researching and having to think a lot about it, the BMW Individual Audio speakers are a direct fit and will handle 75w per channel very easily. You can get a used set on this forum for $650.00 pretty easily or eBay for around $750.00.
The preferred brands of amps in this forum are Alpine & JL Audio. Both make great Amps & DSP's.
Your cheapest option is to get another logic 7 amp for $250-300.00... otherwise, you'll be spending upwards of $1500.00 for speakers, amp & DSP.
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