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It is crucial to find a good Cold Air intake...b/c if you get a bad one, you will actually lose power. As for the computer programming...the only company I would go with is Delage. They are an official race company tied with BMW Motorsport in France...the downside however is that you will have some down-time as you have to send your 4.8 computer all the way to France to get it redone.
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Lemans Blue X5 4.8is
Dynaudio
Diamond TDX 12" subs x 2
Xtant X604 x 2
Xtant X1001 x 1
VST 7" LCD x 2
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