I am going to look at a "e" header and muffler today. What are the visible differences between the s system and the e system.
I measured the diameter of my s header and I get 1-1/2 inches. What is the outside diameter of an e header.

Thank you for your help in advance.

Ken

The E header is 41mm I think, or roughly 1-5/8".

So is the S head port smaller or just the "Stock" pipe.
I can get a Yoshi 2007 SM exhaust cheap, if it will work on my "E"
But I won't if the Yosh "SM" pipe is a smaller diameter... = restriction.
Thx,

The Yosh header dia. is larger than the S/SM stock header. (I think they only make one size header). The head ports are all the same size I believe on the S/SM vs. E ???