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Old 08-09-2019, 08:02 PM   #13 (permalink)
Cyborg ECU
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Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,092

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
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Originally Posted by rmay635703 View Post
Itís easier if the pipe diameter is spot on, length can be made up with flex hose
Agreed, also it introduces a restriction on the flow that probably changes the exhause tune more radically than just introducing the honeycomb. If it undermines scavenging, then the CAT would possibly go part way to undermining the environmental and health benefits of emissions control, since the vehicle might become less efficient, no?

To be clear: I think adding the CAT is a good idea, for environment and health, in LV and in general. Less pollution is the better practice.
See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

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