Originally Posted by GOBLUE

I have the same squeak noise in my roadster. It's annoying on a twisty, bumpy road, but otherwise I don't hear it much. I thought it was due to the leather treatment the dealer put on the seats before I purchased the car. I was going to try Chemical Guys leather cleaner + conditioner to see if that helps reduce the squeak. The other option is to recline or move your seat back a bit more to compress the leather/foam. It seems to help a bit, but may move you out of your ideal driving position.

If the cleaner + conditioner doesn't work this spring, then I plan to put some black carpet (like trunk liner material) on the plastic back panel where the seat contacts. That should prevent any noises, and I'm planning to get the same color as the trim so you won't really see it. If I go that route, I'll post pics.