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Is the flow supposed to go in the bumps into the fiberglass material on glasspacks?

April 26, 2017bumps cars fiberglass flow maintenance material repairs Transportation

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Is the flow supposed to go in the bumps into the fiberglass material on glasspacks?

1 Answer

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Some glasspacks have the scooped bumps inside and some just have flat holes. You want the flow into the bumps for a deeper sound, or over the bumps for a louder sound. But then it might as well be straight pipe. You get nice rappety rappety sounds when it goes into the bumps.