100 hp increase from nitrous (100 shot) is generally considered safe. 125 is borderline. 150 is asking for trouble. It really depends on your other mods. IF you don't have many other mods, you will stand a better chance of going bigger. The block can only handle soo much hp.
Also, going towards the 1`25 range will require fuel system upgrades generally.
I would start with a 75 or 100, get a good tune, a nice kit, and go from there.
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Black 2000 GT Vert: Novi-2000 with Intercooler (375rwhp @ 9 psi); Tune by Kauffmans; Roush 380R Body kit; Steeda Subframes; Steeda Strut Tower Support; Deep Dish Bullets; FRPP 4:10's; SCT 4 Position Chip with four custom tunes; Steeda CAI; C&L Pleum; BBK 75 TB; SLP Loudmouth; SLP Catted X-Pipe; Bullitt Suspension; UPR Conrol Arms; Focus Fuel Pump
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