Patent ID: 8869932

Claim:
A muffler for increasing engine performance while attenuating acoustic noise in a vehicular exhaust flow, comprising: an enclosed case having an inside; two inlet pipes located inside the case comprising: respective inlet ends extending through a frontside of the case and adapted for connection with two outside engine manifold exhaust pipes; and respective interior ends opposite the inlet ends merging together to define a merge entry; at least one outlet pipe located inside the case comprising: an outlet end extending through a backside of the case and adapted for connection with an outside tailpipe; an interior end opposite the outlet end defining a merge exit; and at least one aperture in the outlet pipe communicating with the inside of the case; and a piping merge zone between the merge entry and the merge exit for commingling exhaust flows from the two engine manifold exhaust pipes, wherein the two inlet pipes and the piping merge zone are without communication with the inside of the case.