Hmm, straight through's are not the best for noise suppression, though a review I read on autospeed had the Genie as the best straight-thru for performance/noise I beleive.
Have you tried a dog-leg style?
Center to Center Baffle style?
You may need to go for a turboflow/triflow lukey to get a reduction in noise, they are available in center/offset or offset/offset.
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