Patent ID: 8002080

Claim:
A method for selectively attenuating the sound produced by an exhaust pipe having an internal diameter and a central pipe axis, comprising: a. providing a removable baffle including, i. a first leg, ii. a second leg, iii. a spring portion connecting said first and second legs, said spring portion being configured to urge said second leg pivotally away from said first leg to form a V-spring having a pivot axis, iv. an occlusion plate, attached to said first leg, said occlusion plate including a circular portion sized to fit against said internal diameter of said exhaust pipe, and v. said V-spring being sized such that said second leg must be compressed toward said first leg in order to slide said removable baffle into said internal diameter; b. orienting said removable baffle so that said pivot axis is perpendicular to said central pipe axis; c. compressing said second leg toward said first leg while sliding said removable baffle into said internal diameter; and d. sliding said removable baffle sufficiently far into said exhaust pipe so that said occlusion plate lies within said exhaust pipe and impedes the flow of gas through said exhaust pipe.