Thread: Exhaust Noise
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RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,525
The "cackle" is not necessarily a product of a dual outlet design.
My single outlet muffler cackles quite loudly on decel. The dual outlet prototype that I am running now is actually more quiet and cackles less.

What accents the cackling is a lack of restriction which is a good thing. The more sound deadening material and the more narrow the ID of the system the more quiet (and restrictive) it becomes. Also, a straight through design is more prone to cackle than a baffled design. An empty can, such as the B&B, has potential to be a cackle monster.

You can tune some of that noise out by going more lean on your CO but that defeats the purpose of a performance system. What I do is simply push in the clutch when I don't want to hear it.
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8

Last edited by RarlyL8; 09-03-2007 at 10:48 AM..
Old 09-03-2007, 10:45 AM
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