The ZEX System, in my opinion, is one of the best and safest to use.
But, a simple rule of thumb is not to add more than 30% power gain with bolt ons with out internal work.That being said 108hp stock would put the nitrous at 32.4 hp gain to be safe.Now if you have I/H/E already subtract those gains
from your 32.4hp and you'll see that your 50 shot takes it a little over the "safe" level without internal work.
And even without the blanket, which only keeps the bottle warm keeping the pressure up, you'll still shoot a 50 shot. The inside of your car still get warm, which in turn keeps the bottle warm. They only keep the bottle at a constant temp, the bottle gets colder when you use it, the blanket keeps it at a constant temp. You would still be shooting a full 50 shot the first time you hit the juice.
And yes, I run a nitrous system on my box for those that don't know

. Mine isn't just for show, it is a go mod. My 30 shot will take my box from 80 mph to 120 in a little over 3 seconds

, which is about all the little motor needs.
A 50 shot is, according to the old rule of thumb on the heavy side and will, if not used correctly, kill your box. I have seen people use it wrong, and burn things ( header, pistons, O2 sensors and such the exhaust gets REAL HOT when you juice).
Hope this helped a little, the ZEX is a safe system, but use it wisely or you will be sorry.Also cost around $50 to fill a bottle.