I ordered my car without HK for the soul purpose of carrying out this upgrade, to date I've purchased the ETON B100W speakers and Alpine Sails - total cost: £192 / €230 / $254. Will be picking up the ASD bypass harness next time i'm in Florida.
Don't think you'll regret sound deadening if you find road intrusive, and unless you're into Time Attack a few extra pounds isn't going to make a noticeable difference to the performance.
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M2 / Range Rover
Gone but not forgotten: Porsche 911 cab / S4 cab / M6 / E60 M5 V10 / E46 M3 CSL / E46 M3 SMG (x2)
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