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You don't have to, however it's usually a good idea to put new foam in when installing new seat leather. Depending on the butt miles each seat has, there is a good chance the new leather cover will not have a tight/clean fit with old, warn down foam.
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Originally Posted by MSG C5
You don't have to, however it's usually a good idea to put new foam in when installing new seat leather. Depending on the butt miles each seat has, there is a good chance the new leather cover will not have a tight/clean fit with old, warn down foam.
Unless you only have a few miles on the car, you already have the covers off so you might as well put new foam in there also.
I'm planning new leather as well and my C5 has low miles, however from the stories I've heard from other members, most owners are surprised by how much abuse the OEM foam has taken even with low miles.
I would also suggest performing a search because there are some excellent threads by members who before installing the new foam, performed some additional preventive measures and installed rubber tubing, duct tape, berber carpet, yoga mat material, etc. to cover over the OEM springs, frames and side bolsters preventing the new foam from wearing down as quickly.