Chris,
I have the first four all race ready if that is what you are looking for?
Running a 21- Tunnel? Or a 12-Hydro?
You should add a 1515 to the list also?
In testing this weekend on a 3.5 Tunnel and a 12-Hydro the 1515 was much faster
and accelerated quicker with a lower roostertail than any of the others on this list.
Thanks,
Mark Sholund