I took the silent thunder off of my 271 last year. It sounds much better, no more rumbling and rattling noise. I used the tips that were already installed and just added some rubber flappers on the outside. As far as performance, I didn't really see any change.

Removed my Silent Thunder box Sunday. 4 bolts two guys and it fell right off. The tips are fine just need external flaps. No sound ordinance here. The weight of that box is equal to a grown man. I am going to like having it off.

Just make sure you put on the external flappers before you run it and you will be fine.

Will do.

Thanks

I have a 1988 Formula SR-1 22.3 LS and I would like to buy an Exhaust box. The box I have now is broken at the eye loop and I don't know how to repair it? If any one can help.
Please RP

I have an 88 311 sr1 with trs setup. I would like to know if any of you guys have done this to a similar boat. end goal is to replace with an extreme platform. what external flappers for trs setup....i believe i have 4 1/2 inch tips? should sound sweet with imco exhaust

Ralph
I had a local boat figerglass guy fix mine on my 272. same issue as you. cracked at teh eyebolts. due to the front surface of the plaform rotting ( it is wood). we repalced the whole front with marine plywood, and sealed it, and then regelcoated the showside around the top edge and the attachemnt areas

like new now

about $1000 if i remember

I can send you a few pics if you give me your email address.

I'm at robert.hamelink "at" jci.com ( no spaces)


Ramb

pull the box, add flappers, and make some noise. '02 353, 500EFIs, Corsa when I need it. I'm the only powerboat in a private marina of blowboaters. I take great joy in heading to the marina on Wednesday's (Regatta day) and firin' 'em up and providing a nice bass note rumble to their festivities

menace to society...

Agreed, and now he thinks it's the tits to harass the poor blow boaters. Guess you need to take your victorys where you can. Wait till he has to tangle with the Sea Ray powerboaters in August, may get put in his place then.