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What year is your G, the rip on the driver seat is very common on the G. If you are still under warranty, they will repair it for free, there is a TSB for it. I would use the money for the seats for some other mod.
i think it would be the other way around a valve body upgrade would cut down slipage and create less heat making you need a tranicooler less, but its an auto their not that durable so anything you can do help it live longer is a good investment IMO