I've got an S5 flywheel, with S4 transmission. I've been running a solid (no springs) 4-puck clutch disc with aftermarket pressure plate since day one. I've come to think that a less aggressive clutch disc might be more desirable. Should I use the stock disc, or does a performance aftermarket disc provide some benefit? If so, which one?

Also, it looks like the S4 and S5 discs are different part numbers. What's the difference? Which one do I need?

If I switch from the pucks to an organic disc do I have to resurface the flywheel? I'd rather not pull it from the car.

TIA,