Mo,
Definetly try the 2056 (batpipe).

At Rd 1 I ran the full eb mod ex tech .21 with the batpipe, 6.5 insert and 1 aluminum/ 2 carbon shoes w/ 1.1 springs.

The bottom end was smooth and linear with insane top end and runtime.

With the 2013 this motor was undriveable with carbon's and .9's, lol.

You may have to go to a little heavier spring on the clutch to get the same bottom end feel but I think you will really like it.

Dayton