OK.... I know this is a dumb question but I just cant ever seem to remember this one. Anyways.... the question.... What is a 4-1 header best for and what is a 4-2-1 header best for?

thx,
Eric

PS. Im gonna write the answer down

 

4-2-1 (or tri-y as they are sometimes referred to as) are known for being good for midrange hp and tq

4-1 are better in most cases for high end hp and tq

Thats the basic gist of it, however, that isnt always the case, but its the general concensus.