What would be the problem with running these on the street? Looka alot like the setup (the throttle bodies) on my R1....and that intake is pretty sweet (price is not bad either...I could not make it for less than that).....thats one sexy set-up.....
I can see that balancing them out would be difgficult for some people (the right tools make it easy)...but you really do not have to do it that often....and it really only affects off idle snap and some idling issues (out of balance will creat a hunting of idle...but its not enough to bug most people).