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Discussion Starter #1
Just built up a 331 with equal length BBK shortys, BBK offroad xpipe and a magna flow exhaust system. The car is registered as an antique so I don't needs cats however I have lots of boominess around 2k and am trying to figure out what I should do in terms of adding cats or a quieter muffler system. Thanks
 

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Just built up a 331 with equal length BBK shortys, BBK offroad xpipe and a magna flow exhaust system. The car is registered as an antique so I don't needs cats however I have lots of boominess around 2k and am trying to figure out what I should do in terms of adding cats or a quieter muffler system. Thanks
Are those chambered or straight through? chambered will be quieter, in my experience all aftermarket exhaust on a SBF drones. The best muffler i ever bought was a 76mm turbo. My exhaust went from nobody being able to hear me in the drive thru to it sounding stock... and those are straight through mufflers....
 

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Discussion Starter #3
I have the magna flow cat back kit designed for the fox mustangs. I believe it is chambered. On another note, is running without cats risky as to excess carbon monoxide making its way into the car? Thanks
 

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cats do not remove carbon monoxide.. they remove hydrocarbons aka unburnt fuel from your exhaust.
 

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As mentioned above. It's the drone that you hear. Search in the forums for Helmholtz and there is a long thread about how to make it.

ks
 

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I couldn’t stand mine being so loud I installed 2013 Mustang mufflers. Built in helmholtz chamber as I had zero room for extra pipes with my torque arm and panhard rod.

SOLVED! Gloriously fun to drive again.

333ci LTH, 3” into 2.5” X pipe.
 

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I couldn’t stand mine being so loud I installed 2013 Mustang mufflers. Built in helmholtz chamber as I had zero room for extra pipes with my torque arm and panhard rod.

SOLVED! Gloriously fun to drive again.

333ci LTH, 3” into 2.5” X pipe.

Any videos of how the exhaust sounds,
 

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No but once I have her back on the road I can take one. Interior is out and parts strewn around the garage for the next few weeks.
 
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