just keep the fat chicks off it!

Dont suppose you have any pics of the modification?

I had installed a teak swim platform originally and now upgrading to this prototype we made out of Starboard with a 34" projection from transom. It's going to mount just at the top of drive gimbles which places it 1" above the water at rest. That's where teak platfrom was mounted and made it perfect for any use.

Going to install as soon as my knee surgery heals up enough to "git 'er done".

Would be interested to know what that unit weights. Thanks.

"Chicken"......

Been watching this thread with interest. I have a friend with a 1988 311 last season we built new 468's with Revolution Marine exhaust. We then replaced the black exhaust hose for polished stainless tubing. Looks reeally sweet on the inside. We then looked at the swim platform/Silent Thunder exhaust and decided we wanted better exhaust flow (sound). We talked about removing the original platform and using the aluminum tube platform. They, (wife) wasn't sure about that idea so we looked at the existing Silent Thunder system. First thing was to remove the baffles just inside the rectangle openings. Gotta give Formula credit, even the freaking baffles were solid as a rock. Had to sneak the boat to the fire station and use our extrication equipment, (jaws of life) to cut the baffles. Then we cut large holes in the bottom of the boxes so the exhaust water could drain out the bottom rather than get blown out the rectangle ports. The Silent Thunder swim platform is now an echo chamber that still has a deep throaty sound but deffinately picked up some decibles, especially at higher RPM's. The big plus is it HAD to allow the motors to breathe a lot better. We looked at running tips or stainless tubing out through the rectangle holes also, (as was mentioned above), but was going to be a lot of custom work with little if any performance gain.
I admit I love the looks of y'alls boats with the platforms removed, but if you can't, or don't want to remove the original platform, there are ways to open things up.

You've met my wife

I also prefer the look of the platform. Makes it look bigger so my 27 looks like a 29

I am assuming that on the 242 the exhaust tips would exit around the red dots on the attached picture.

If thats the case, the heavy internals could be removed to lighten the platform, the original rectangular tips could be removed and made good and the new tips could exit at the points shown and be fitted with salisbury flaps to prevent reversion.

What do you think?

HAven't had a chance to weigh the Starboard platform yet--I made the mistake of loaning my PU truck to someone so I cna't get it home. Last time I was at the shop it seems like it weighed about same as old teak platfrom that's in the picture also.

I know that's a lousy answer--but at least a comparison for now.

You are going to have to find a reference point to determine exactly where the exhaust tips come through the transom. I believe you will find they are much higher than your red dots. On my 311, after I had modified my Silent Thunder Box, much in the same manner as the above thread, you could easily look up inside and see the short tips coming through the transom. They were probably seven inches higher than the rectangular tips. Look at the picture I'm including here and take note where my new tips exist the back of the boat. Notice the relation to the distance from the rubrail. I don't know if it's the same on your boat but what you could do is take a measurement from the inside of the engine compartment from the top of the exhaust hose to "something" then transpose that measurement to the outside and you can then determine approximately where they will exist. Hope that made sense.

Be sure to check the next post.