Re: " Y " tube
Thanks for the replys,the reason for the query the boat has a 250ci L6 in it so it would apear the L6 used a 3 bolt flange as well as the 4 cyld and I am looking to upgrade to a 260HP 350,I can do a thru transom system but I would like to keep it as quiet as poss with exhaust thru the prop,maybe they were not made so I may have to make one