I really want to keep it simple for ease of instal and reliabilty and for that reason am leaning towards the 2 stage. I already have a dual digital window switch so cost is basically for a second set of solenoids, nozzle, a bit of plumbing and a switch.

I won't be doing anything before Oct 10, just thinking about the future to widen that gap

 

id go with a dual stage plate from Nitrous outlet. Those suckers are baddass!!!!
Im running The P guage from trick. you can progressively ramp it up or down or by time. Highly recommend it!

 

i have the FJO progressive controller so i have the option of going progressive, or 2 stage...

ive played with the progressive some on the index races i run...im not completely wild about it. when i get up to the bigboy shot im planning to go the 2 stage route through the nitrous outlet dual stage 90mm plate. spray 125 out of the hole and another 100 as soon as 2nd gear hits. its easier on the solenoids and you can control it easier with the pills in my experience.

but if your only planning a 100 shot it may be more budget safe to go with the progressive setup. FJO controller IS THE **** if your looking into controllers. i can choose whatever i want my nitrous to do with my laptop computer.