Length of Tail Pipe Efficiency

[jere]

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.

[Frank Lee]

I do know that if you drop the exhaust right before or after the cat, it runs poorly and loses noticeable power.

[some_other_dave]

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