Someone mentioned that you loose your warranty when adding a spi to an A-cat. I haven't seen that note on any A-cat builder site! Actually I haven't seen ANY kind of rules for what you can or can't do with your A-cat and still have a valid warranty. Please check facts before stating such a thing!
Hi Mate,
As far as Autralian High Performance Catamarans are concerned (builders of the Auscat Flyer and Boyer boats) they have a very clear warranty for all their boats wich you can find on their website.
A Class warranty link 
