Originally Posted by JHM2K
Did you have the shop weld a 2.5" pipe to the rear of the muffler? Reason I ask, the ANSA inlet is 1 7/8" from the factory. Even at the step-up near the case, it most only be 2.25" at the MAX. If you welded a bigger pipe to the rear, even if only slightly bigger, there may still be a small lip of metal that the air is trying to squeeze through when it makes the bump from 2.5" piping to a 2.25" hole.
This lip might just be causing a whistle noise... after all, a real whistle (referee style) is only a piece of steel with a sharp edge for air to pass over.
Think this is a possibility?
John, you might have something there. I did not check his work, but he said he would weld a 2.5" pipe to replace the 1 7/8. Of course, if that is the case, I am not sure how I would check to confirm it. Thanks