OK, prepare your loins this will be a multi-part post.
Lets start with the old seats...
I landed a pair of black MSM seats with silver accent stitching a few years back. I had these in my NA, transferred them to my NB before I sold it off.
They are nice. They sit higher, but firmer and comfortable. I condition them regularly, but even so, the leather is a bit on the stiff side. They also suffer the 'infamous' flattening bolster on the outboard side that some companies like Paco and IL Motorsport sell bolt on supports for. I was never a fan, so I decided the best course of action was to refurbish the foam.
It's a pretty labor intensive job, but not difficult. I bought a $40 household steam cleaner on Amazon and went to work. I separated the seats into their components:
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Using snips and dykes, I cut off the perimeter hog rings that hold the upholstery to the base:
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I didn't touch the center sections. My goal was to restore the shape of the foam bolsters and re-align the seams. This top view shows how the the bolster foam compressed/collapsed and the seam slipped over the peak. It looks like a bloated tick.
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I lifted up the upholstery and and applied steam, using distilled water. Cue soundtrack:
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Here is a quick video, hard to shoot but you can see how much volume comes back with a few quick shots of steam. Repeated, I got quite a bit more and it sort of reminded me of a marshmallow in a microwave. ;)
After allowing it to dry a bit, I reassembled, cleaned the leather, and moisturized. There was an indentation on the back, near the top where my rollbar presses into the seat. I pushed one of the steamer attachments under the cover, and a 5-10 second shot eliminated that sizeable 'dent'.
Here is a before/after of the seat bottom:
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I repeated the process with the passenger seat (left below), completed driver's seat on the right:
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Finished product:
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