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Okaaaaaay - after much persuasion - here is my solution to the NOISE problem on these conversions. More power = more NOISE! Whilst the standard 2bular 7"dia K-Series silencer has been fine for most trackdays, these conversions have been having problems meeting decibel limits.
I have used the 2bular H2 silencer (Two Helmholtz chambers). With two internal noise-cancelling chambers it's a complete PITA to fabricate and weld. You can see the internal spot-welds used to secure the plates forming the chambers. The silencer has a straight-thru perforated core-pipe but it does not continue end-to-end, so a lot of strength is lost in the unit. I use two end-plates at entry/exit to help reinforce those areas. I use a double-skinned silencer to cancel any drone caused by those open chambers.
So, a double-skinned silencer and 6 baffle/end-plates - more weight and cost but all necessary to help control the decibels.
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