If you do this I would check your plugs VERY often to make sure the thing is not going lean (plugs will be light brown spotted and in some cases the electrode will be melted some).. This sounds like a dangerously large dry shot IMHO. I would not do this personaly unless you have a wideband afr guage to monitor, and/or a lean condition nitrous shutoff.
you might as well use a wet shot if you going to run a 125 shot, just my .2 its alot safer
2005 rcsb silverado 4.8L, Full bolt ons, obx lt's, ory, comp xr265hr hi lift, Nitrous outlet plate kit, built 4l65e, J-H shift kit, 2500 stall,3.73 G80 , 3 inch spintech cat back, tuned by Rick at Synergy motorsports