It seems that this bar would be better than spraying in the elbow but not as good as a direct port. Has anyone tried this?

Spray bar plenum

I can see where it would improve N2O distribution. But how would it be on puddling and N2O intake backfires?

 

This type of system would be the equivelent of a plate sys on a carb. Definatly better distribution than putting a plate in back of the throttle body. This sys would HIT really hard to Good if your on a small tire w decent suspension work (shocks and anti-roll bar). As far as backfires goes any time you add to much fuel and not enough No2 and timing you get the BIG backfire. Puddling should'nt be a prob either.