Its off my brothers camaro...It was a wet kit but converted into a dry kit with the dry nozzle they sell. I just called him up because I got confused too.
My compucar wet kit sprays right before the t-body. IIRC only the Chevy n2o kits do the before the maf thing. It is not soo good to do that in a mustang...at least I wouldnt do that.
buddy of mine ran a 150 shot on his 87's stock 19's...I wouldnt do that myself. But a 100-125 shot should be ok. Getting a bigger pump is also a good idea on a shot larger than 100hp.
My brother wants to know how the car knows when and how much more fuel to add through the injectors so that is not running rich on DD driving or super lean on the spray.
His LS1 MAF detects the density & temp of the incoming air and adds fuel appropriately when spraying (nozzle is placed before the MAF).
there is a vacume tee that has a line that goes to the fuel press. reg. to the tee that is placed/attached to the n2o noids. When the bottle hits it makes the vac. go high (like 80psi or something) and that is were the added fuel is gained.
If the kit you getting does not have this you may have to order it as it may be specific to the ford kit.