Quote Originally Posted by Leon R View Post
A more pressing question: why do we even have a flex section? It is between the two "Y sections". What flexes between them to require a flex section?
My shop explained that these are used on transverse mounted engines where side-torquing increases/decreases the distance from the manifold to the [static] pipe location. That makes sense.

Since our engines aren't mounted sideways, the use of this piece must be to dampen vibration down one side of the "Y". I'm guessing that "halfing" the vibration to the "unioned" junction might have resulting in some reduction of pipe vibration.

I tried one in my Corvette -- and it made vibration WORSE! LOL Took them out the following week. (I put one on both sides.)