I bought a set of staggered 20" package from AM for a special person's special day (no stupid comments needed here). Upon recieving the package they refused to install them because they "heard" it would cause damage to their Stang. ??? I was disappointed to say the least ... but it's his gift. My question after that long lead - will a 20" package actually hurt a suspension??? I found it hard to believe but it's not stock so there could be something to it.