Aprilia Racing Anti-Slosh Oil Pan Gasket
Complete fitment list at bottom of this page.
This official Aprilia Corse product incorporates an anti-sloshing plate into the standard oil pan gasket.
The purpose of the plate is two fold: One, to keep oil in the lowest part of the oil pan to prevent oil pump starvation. Two: to keep oil from sloshing up, and onto the crankshaft.
This part is probably not necessary for anything but the most serious racer, but it is an interesting glimpse into all the methods that Aprilia's Racing department uses to make the RSV4 faster.
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An excellent high performance alternative to the stock 857497 Oil Pan Gasket