exhaust

[sinus]

Hello;

Dry exhaust for 200 hp engine it is 1500 mm long from engine to the collector 4 in 1.
Any idea how shorter must be if I use classic marine exhaust with water around of pipes?

[Powerabout]

Hello;

Dry exhaust for 200 hp engine it is 1500 mm long from engine to the collector 4 in 1.
Any idea how shorter must be if I use classic marine exhaust with water around of pipes?
Photos might help