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I've got the OEM Audio+ reference system, and have the doors/quarterpanels/trunk sound-deadened. The sound deadener DOES help with the doors quite a bit. If you're planning to keep the stock head unit, and also planning to sell your BRZ down the road then i'd recommend the OEM+ system. The quality is great, and is several steps up from the stock system (especially in tweeters and volume potential). If you are moving to aftermarket stereo then a custom install is much easier.
Do you like how the stock system sounds now? If so, you may be happier with just a sub. If you're not impressed, then go with the OEM+. You can always resell down the line and make back most of your money.
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