Hi. I was wondering if it's possible to ride my 2010 slingshot rally with a four line north bar? Not sure if the pig tales are the same. Anyone know?

I could be wrong (have been many times in the past)

it should work.
Most bars at full power (no depower on and bar pulled into chocken loop) should have front and back lines at equal length.
Pig tails can be swapped around.
One issue is that you may over power the kite, (stall backwards) or have it under powered.
I swap bar and lines between a Rev and Argo

Knots & loops not aligning is an easy fix - figure that one for yourself.
And yes MOST brands are now running equal length lines - but not all.
Stand to be corrected here but I suspect North may be one that doesnt fit this set-up.
Be keen to hear if Im wrong actually as its one I havent checked myself - just going by others comments.

I have seen a couple of posts suggest that using another bar that has "Y" point in the front lines higher or lower than the stock bar can make the kite fly differently.
No idea it it is true or not.

Anyway, i am looking at making up my own "Franken-Bar" with components from a few other bars.
Zeeko UDS depower system, Switch chicken loop / quick release and probly keep my ocean rodeo bar and lines.