Run a bed stack that doesn't have a base, with our adapter plate. No additional brackets required. Simply drill holes, bolt to the floor of your truck bed and mount your stack. CNC laser cut, TIG welded 304 grade stainless steel Base plate measures 10.5" x 10.5" Stainless mounting hardware included Offered in raw stainless steel or powder coated for a durable, clean finish Choose between 4" or 5" to fit your exhaust Optional 304 grade stainless band clamp Size options: 4'' ID - 4'' OD (one side has a "male" end, other side has a "female" end) 5'' ID - 5'' OD (one side has a "male" end, other side has a "female" end) You can run the plate right side up or up-side down, depending on your application! **Our exhaust stack mounting plates are currently built to order, please allow ~1 week for build time**