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I really like the second skin damplifier, it's easy to work with (cut and apply) without the huge mess from butyl getting stuck on everything. I wouldn't recommend knukonceptz deadener, it's extremely messy and I got some in my carpet and is very difficult to get out.

I have dynamat on my trunk lid, knukonceptz on the trunk walls and floor and second skin on my doors, roof and rear floor. Second skin is kinda expensive, so if you're on a budget I would suggest getting another brand.