10 finally referring to fig1 a rear three quarter view of one embodiment of the present invention is shown with imperforated throat 15 and flat end cap 12 either of these two possibilities may exist independently or in combination with any of the other possible variances suggested in this disclosure from this perspective it can easily be seen that end cap 12 does not contain a lip directed either inward or outward or any additional flange which would reduce or deflect the amount of gases passing from an exhaust pipe not shown through device 10 as such this simple embodiment of the invention does not usually extend past the opening of an exhaust pipe the diameter of end cap 12 can be sized to fit any model exhaust pipe and it can be secured in any manner previously suggested throat 15 may also contain an additional core structure within it or extending from the end of throat 15 additionally throat 15 may be cut short so that it does not extend as far into the mouth of an exhaust pipe throat 15 may also be shaped in different patterns which are not necessarily cylindrical and possibly change the direction of gases flowing through throat 15 the tip of diffusing element 16 can also be seen in this figure and be configured or constructed as suggested in this disclosure the present invention includes any novel feature or combination of features disclosed herein either explicitly or any generalization thereof while the invention has been described with.