i have rigid collars (rigi cola) ahah, cant really "feel" a difference but definiatly aligns the subrame and straightens it to the chassis, after a wheel alignment everything is straight.
Gimmick IMO. If they're torqued properly apparently you have no problems.
And if your car has a good alignment don't worry. Doubt the few millimetres of potential migration would cause major alignment issues that couldn't be fixed with a decent 4-wheel alignment.
I know people who swear by it and I've driven their cars before and after... IMO I don't notice a difference on the street... Haven't had the opportunity to track a car before and after putting them in.
In principle it is a good idea... In principle...
But being a little old school in thinking if the right torque is applied to the bolts already then the slip (if any) will be marginal. Also if your car has already had a 4 wheel alignment done to it then putting these collars in could very well undo that alignment requiring it to be redone...
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