https://granatellimotorsports.com/i-30501085-granatellimotor-sportsvacuum-pressure-controlled-electronic-exhaust-cutout-systems-stainless-steel-slip-fit-309525.html

2.5" (63mm) Electronic Exhaust Cutout System - Complete

CNC 6061 Aircraft Quality Aluminum Body Construction
"Smart Chip" Controlled Motor Offers "One Touch" Operation Rocker Switch
No More Needing To Hold The Switch Which Usually Damages The Internal Gears
Stainless Steel Butterfly Plates & Blade Shafts
Unique V-band Clamp Allows Turndowns To Be Rotated 360^ For Ultimate Adjustability
Polished Stainless Steel Turndowns Offer 45^ Slanted Discharge Angle
High Torque DC Gear Reduction Driven Motor Insures Total Open and Total Closed Operation Everytime.
Drive Gears Made of High Temperature Carbon Steel