Factory modifications for Manley Mahi Mahi

Are there Manley factory modifications for the Mahi Mahi monoblocks? I've checked their website and A'gon discussion forums with no luck. Wanted feedback from owners who have actual experience with upgrades. Thanks.
If it is performed by the manufacturer it is an update. If it is performed by some guy in his garage or a workshop in the back of a stereo store it is a mod.