ngsm13
5,000+ posts
BSEE
Caprices trunks are sealed off. The seats don't fold down, and there is NO hole into the cabin. You can however cut quite a bit of metal out of the rear deck...Really depends on the car. Most of the Caprices around here have it firing into the cabin.
You could always do a bandpass and fire it straight into the cabin and completely seal it off.
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It's MUCH better to fire towards the tail lights in caprices... I've installed at least 50 systems in boxes and bubbles. Second best is firing at the trunk lid, but that's only if it's the only way it will fit (like with a pair of 18's).
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nG