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Old 03-03-2011, 12:58 PM
duboy duboy is offline
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Join Date: Dec 2010
Location: Atlanta, GA
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I'll chime in as an owner of an X5 with the BSW stage 1 kit installed.

I will preface this by saying I did not purchase the kit myself, it was on the X when I picked her up (and actually my X is the one that BSW used to test fitment etc for the kit) but I have heard stock X5 w/DSP and various other BMWs with DSP. They use Rainbow (i think the IQ line?) drivers/tweeters in the kit. It doesn't affect the dual coil sub in the rear obviously, so you don't get any more "punch" than you do normally, but with the kit installed there is actually separation and clarity.

If you want considerably better audio quality/clarity but don't want to mess with the actual DSP amp etc, then it's really not a bad kit. Yes you can spend less and get awesome sound too, but keep in mind that the BSW kit has the proper fitment and resistance ratings etc for your E53.
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