Last I heard the collector on the Dynatechs were 2.5"... Not sure why they would have a 3" ypipe since that would seem like it would just bottle neck the system. I would imagine the y is a 2.5".
The two collectors are 2.5" merged into a 3". However, the angles are quite sharp and the Y. I am thinking about modifying the Y to eliminate the turbulance.
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