Indepedent Rear Suspension (IRS) in a 4th Gen
#181
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IRS is for comfort. And even then it can ride worse than a solid axle and have more NVH than a solid axle car, if it's not set up correct. I've riden in some IRS cars that are good, and some transmit more tire noise through the cabin and ride worse than my solid axle 4th gen does.