Trident Marine 6" ID Blue Silicone Molded Wet Exhaust Hump w/4 T-Bolt Clamp [270V6000-S/S] Brand_Flitz The trim piece size is

The trim piece size is 18

UPC: 840248205931

with siren and horn features

The Evolution EV-150 system also employs Raymarine's patented Hydro-Balance™ technology which delivers superior autopilot performance for hydraulically steered boats

Then this is the option

Trident Marine 6" ID Blue Silicone Molded Wet Exhaust Hump w/4 T-Bolt Clamp [270V6000-S/S] Brand_Flitz The trim piece size is6" ID Blue Silicone Molded Wet Exhaust Hump with 4 T Bolt Clamp This silicone and rubber hump hose provides the ultimate flexible connector for marine wet exhaust systems. The hump hose offers much greater tolerance to heat, misalignment, engine movement, and vibration, with significant savings in cost, parts, labor, and space. Construction: Tube & Cover: VHT blue silicone Color: Blue Reinforcement: EPDM Silicone Rubber Temperature Range: 350F (177C)