I'm surprised I never hear this with DR's but on the SV650's its common practice to remove one or even two of the head gasket layers to bump compression a bit. The gaskets appear to be the same type and my SV has been running around fine that way for a long time. The DR has three layers about .010 each and the base gasket is two layers. removing one layer on each would be like milling the head .020. It would throw off your cam timing by a tiny amount but that would retard it and give you more top end,.. probably a miniscule amount? Cars also use multi-layer metal gaskets and tuners peel layers to adjust compression. If you have the head off this is a free mod,.. has anyone done it??