Cold Sweat

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...

TylerBurich

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.

Full Force

iTrader: (5)

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..

TylerBurich

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.

Cold Sweat

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....

Full Force

iTrader: (5)

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..

TylerBurich

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

Full Force

iTrader: (5)

Thanks!

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

poiuy10

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 !

jeff32

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...