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The EM side pipe are made by EM and are a sort - of Lobak style. The problem was that the"fins" set away from the sides of the pipe by about a half inch. In other words the diamter of the fins is about 3 inches but the side pipe is 4 inches in diameter, so the exhaust sort of just flowed by the fins and thus they had no discernable effect on the noise level that we could detect. I understand that EM is redesigning the pipes.
The good thing about the EM pipes is that they would not likely have much back pressure.
There was not much differene between the EM side pipes and no pipes.
The Stainless Specialities side pipes made a world of differnce. Still loud, but manageable.
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