Re: 87 242 thru-hull exhaust options
 

Here is one tip from eddie marine, I believe $59 each with no flapper inside. If you go with this one ask if they can cut the tip to 1' that should be just enough to go inside the platform. You might want to find the rectangle tip for the outside of the platform, for the most part it`s only cosmetic unless your using a flapper

Re: 87 242 thru-hull exhaust options
 

Thanks for the pics and info, this is great stuff! I see they make those tips with and without flappers. Would I want flappers so I don't have any chance of hydrolock or is there a negative side to having flappers?

Re: 87 242 thru-hull exhaust options
 

I don`t believe you would need flappers, personal choice.

Re: 87 242 thru-hull exhaust options
 

You could have a couple of problems you will need to sorth out before drilling holes. You need to check the height of your risers to make sure you have enough fall to stop water incursion at an idle. Also you need to check your water line under the platform to decide if you need internal flappers or simple backup flappers will work. As a master mech. for 15 years i have done this on several older Formulas like the 272LS and the 242Ls twins and singles. There are several ways to make your boat louder but not all are fesible both in price and application. If you would like to talk about this you can send me your phone number and I will try and help you with some options. Since going into sales and with the new models that have came out since then. We have put custom Corsa kits on boats like the 280SS and 330SS. Want to talk Formulas dropme a line at [email protected] I been with a Formula dealer since 1979 and last year we were the largest dealer in the world!

Re: 87 242 thru-hull exhaust options
 

That sounds great, I'll shoot you an email
Thanks

Hello. I know this is an old post, I am curious if you were ever able to complete your thru hole transformation. I am in the same "boat" 1987 formula f223ss 350 mag swim platform, and no thru platform exhaust. any help would be great