Talk Morgan Forums Morgan Sports Cars Morgan Three Wheeler & Super 3 Which exhaust?

Just had a reply from S&S about exhaust set up.
Email as follows.

Hi, John.

There is no simple answer to your question. When tuning exhaust length, all one can really do is optimize the power over a relatively narrow RPM range. At all other RPMs, the tuned length becomes irrelevant. That being the case, here is an equation to help you determine optimal header length.

L= 950 x 233/RPM

L=Length
RPM=RPM in the middle of the desired power band

The engine wants, at a minimum, around 3000 RPM with a good cruising range being 3000-3800 RPM, so if we select 3400 RPM, we are looking at an optimal header length of 62.3"

The Morgan header pipe is 1 3/4" diameter so you can fit just about any Harley muffler to the header that you desire as long as you can rig up a bracket to mount them.

Let me know if you have any other questions.

Any thoughts?
John.