Tunable sponsons for personal watercraft and personal watercraft having the tunable sponsons. The customization is implemented to optimize the sound level for each individual cochlear implant user. The turbine shroud further includes a plurality of circumferential seals that seal circumferential interfaces between the shroud segments. A flow control is fitted to the screen body. In other examples, ends of the one or more guard traces can be coupled to ground by indium tin oxide or the one or more guard traces can be coupled to ground by a strip of indium tin oxide.