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Old 05-18-2013, 01:38 PM   #11 (permalink)
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Off topic- Ryland love your avatar, do you have a link to more about your citicar? I worked with a lady and her husband worked for GE and got one new when they came out. She always said she would bring it in one day, but I never got to see it. Do you have a picture stash of it somewhere? I would be great to see more of it than that little pic.

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Old 05-18-2013, 04:04 PM   #12 (permalink)
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I do know that if you drop the exhaust right before or after the cat, it runs poorly and loses noticeable power.
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Old 05-19-2013, 07:19 PM   #13 (permalink)
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In theory there are still exhaust pulses after the primary pipes merge. They are much less strong, but secondary length can still be used as a tuning aid. It follows the same general rules of thumb as the primary tubes--longer and thinner helps scavenging at low RPMs, and fatter and shorter allows more flow at higher RPMs.

But it is less important than the primary tubes.

-soD

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