With a 100 shot and a 10lb bottle, you'll get about 3 good full 1/4 mile passes, and a possible 4th one.
With each pass, the pressure will drop some, especially if you don't run a bottle heater. You want to maintain about 1050-1100 psi of bottle pressure for proper mix, and consistancy. If you are just planning to do some blasts here and there on the street, you'll get a few more hits off a 10lb bottle.
I always use 15lb bottles whenever room allows. More capacity and less pressure drop off. I doubt a 15 would fit well in a Cobra though
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Sal Mennella
CSX 4241, KMP 357 - sold and missed, CSX 4819 - cancelled, FFR 5132 - sold
See my car at CSXinfo.net here >> CSX 4241