TCM ST-450 SWITCHABLE EXHAUST MUFFLER SYSTEM - 4.5" OD Hose Angled Connection

There is no better way to control your engine exhaust noise level than with TCM's proven ST-450 Switchable Exhaust Muffler System. By simply activating a helm mounted switch, the driver can select either an unrestricted open or muffled exhaust. If you have a performance engine with thru transom exhaust, the ST-450 System allows you the option of quietly idling through harbors and no wake zones. Then, with the touch of a switch, open the system for maximum performance in unregulated waters. Electrically actuated ST-450 will deliver as much as a 10 to 15 decibel drop in noise level at the tip of your finger (eliminates unreliable pneumatic pumps). The TCM ST-450 System is recommended for use on all engines from stock to the most radical supercharged motors using thru-transom, wet exhaust. The ST-450 HP CMI is especially designed for engines using CMI elbow top exhaust when the holes in the transom are standard Mercury Marine dimension. All TCM ST-450 Systems are manufactured in-house. We offer a 1-year limited guarantee on workmanship and a 90-day warranty on electrical components.Requires cutting of the factory CMI tailpipes.304L stainless construction 4 1/2" diameter Opperational range: Idle to 3500 RPM

st-450_instructions.pdf

st-450_CMI_Instruction.pdf

We do not accept returns on any muffler