"Boa" wadding installed and all welded up. The result is the resonation is now just very slight at 2,000 rpm, so much better than before I started these mods and quite a bit better than the mod of the 2 chambers.. The exhaust note is slightly different, a bit more of a deeper rasp, sounds good. It is certainly not a "stealth" car but it quieter than it has ever been. Your results will vary, smaller dia pipes, lower duration cam, lower compression, etc..
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