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1997 Carver 325 exhaust collector


Just wondering if anyone else has removed the backflow valves in the exhaust collectors? I cannot see the need for them as they are well above the outlets under the platform and after the muffler if looking from backflow direction. There are also rubber flappers on the outlets.
I'm assuming that the exhaust is still factory installed at around 1100 hrs.
The pivot bushings in the valves were completely worn out and rattling. There's two valves in the collectors, one for each bank.
I have removed the valves in the starboard side collector in prep for next years boating season and want to be sure i'm not missing something here.
Thanks.

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