Only downsides I've experienced is if there are any loose interior parts on the car, you'll hear them due to the vibration (Then you know what to tighten, so not so bad after all). But that's only when taking off from a stop. If you interior is tight then you probably won't hear anything. And phantom knock which some people get. Vibration at idle isn't as bad as most people say. My dad DDs a caddy and has never commented on my cars vibration when he drives it. I recommend them.





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