Best exhaust for Formula w/TRS
 

Having my 420's rebuilt and need to change exhaust. Bore and stroke to 496, new roller cams. Hope to be around 500HP when they're done. My old exhaust was a proven engine destroyer, the old Merc w/SS tails...Before they went to the Merc/Gil system. Any suggestions on replacements ? Boat is a 1988 357. Thanks...:ernaehrung004:

When i had to ditch my original merc stuff (same as yours) because they were leaking so bad i went with imco powerflows. It was june in illinois and i was ready to be back on the water, teague had them in stock with the longer tails for trs application. You have alot of options but I am still happy with my purchase, they sound really nice.

want looks or affordable?

I went affordable and used stock 496 stuff on mine, 500.00 for take offs on each engine, nice stainless risers, you can have the black taken off and polish them, I left mine black for now..

Full Force...Did you have to recut your transom holes? My trs risers go a lot higher up than bravo set ups. I looked into revolution marine when i was doing mine but they said i would have to recut my outlets in the transom or they wouldn't be able to get the water out.

I was trying to find 2 used sets, but the TRS risers are hard to find. I also want the long 6" taller risers. Thanks for your info and pics, always helps to see how they look in the boat.
Anyone else have any pics to share ? Thanks again....

No holes are same location, I am TRS also, I used my same holes but made them 4" they were 3" before, I have no issues whatsoever..

http://i36.photobucket.com/albums/e4...g/113_8265.jpg

full force it looks like your exhaust hoses are touching, there is almost no room between your engines! I can fit my arm between my two inboard manifolds. Nice looking motors by the way:ernaehrung004:

Thanks!

Yea, my engines are tight certerline, usually they are wider...

Coldsweat,
I basically did what you are doing, I went with the CMI's. here is my add on another site, to see the application.

https://www.boatcrazy.com/search/details.php?id=468

see what you think, the original owner re-drilled the thru-transom higher as you can see its above the taco rail in the back. Good Luck !

do you have a pictures of your current exhaust? I just want to see if your ''engine destroyer'' exhaust looks loke mine????

Also thinking switching for newer exhaust, for the affordable way...

I also had a 1986 f 35-7, and I have left 1 set of stainless marine exhaust that I never even tried... did they have stainless marine exhaust back in these days or they were newer exhaust ? maybe I could use them now????

Jeff, I don't have any pics to post. They are the stock cast manifolds used on the first 420's. They have a rubber gasket between the manifold and riser. The tails are stainless and also have gaskets at the flange joint. Water flows thru gaskets instead of using hoses like the later Gils. The rubber gasket is the problem, just not a good design. I suppose if they were changed every year, they'd be fine.
When I bought the boat, the damage was already done. Plus the water ports between the tail flange and risers were clogged with scale from 20 years of no maint. Gota have water flow thru the exhaust or the engines over heat. If you have the pre gils, change the gaskets. you can still buy them if you get a part # and google it. If you need it, I can get the part # for you.

Those are sweet, I guess they make them for TRS. Nice clean installation. Might be over my budgit, this boat is killin me. But I will have two new engines when I'm done. Thanks all...

If I were in your shoes, I'd buy a set of Stainless Marine manifolds/pipes. 5 year warranty. You can't go wrong with Stainless Marine, they make great power and last forever.

Kurt