The MR2 uses external amplifiers and sub-woofer amplifiers and so the installation of a new head unit needs a little more thought than for most cars.
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You need to provide a little more info.
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What is the year and model of your car.
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Do you just want to swap the factory unit for a single cd-receiver or multi-cd changer etc.
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etc.
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Does your new unit have built in amplifier and/or outputs for external amp.
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etc.
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etc.
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You need to decide exaclty what you want to install and then you can get accurate advice on what you need to do.
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