those numbers are entirely within reason.
Betting that you use a wet kit for the giggle gas, I would check your AF on the nitrous runs. I'll bet you're running too rich on the fuel jet. You would probably want to drop .05 from the jet orifice size. Leave the nitrous jet the way it is and check the AF again.
Other than that, I've seen hundreds of dyno runs by new edge cars with bolt ons just like yours and they all put down within 15hp of your car. It's not the strongest I've seen but it's not weak.
You're pulling on your cobra driving friend because your torque is super high on nitrous and you don't have to spin a blower to make that power so there's more free power. This is the reason I started with my 5.4L swap... more tq means mo' bettuh pulling power.
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