4cyl engines tend to rattle a bit more. Like jhbhatia said, check you're engine mounts. If its a Gen4 or less you may need to replace them.
Unlike a turbine or to a lesser extent a rotary engine, piston engines reciprocate and 4cyl engines inherently suffer from the most out of all other common engine configurations.
If this is something you've noticed lately, its probably a bad mount, if not then get used to a it. But remember, your 4cyl saves you on gas and maintence. A timing belt job on a 4cyl is a breeze compared to a V6.
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