vibrant j style o2 spacers

[Riptide]

Got a set of these to try out. These have three different "jet" sizes you can choose from.

What would be the best jet size to choose on these? I'd like to get this right the first time since the midpipe may need to come out for the install.

Thanks

http://www.jegs.com/i/Vibrant-Perfor...yABEgK1R_D_BwE