If you are going to upgrade the stereo you need to forget about the added weight. You will be adding weight with high performance speakers, amplifiers, head units, cabling, sound damping, etc. To me, it's a worthwhile trade-off. The 1/10th of a second off my 1/4 mile times is insignificant to me. However, the increase in pleasure I get from driving my Z with an incredible sound system is significant.
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