How much hp has my car gained?

I got a question, just curious, I have a 06 automatic honda accord v4, and I m wondering about how much hp my car has gained from the mods, I have kn intake, DC sport headers, Megan exhaust system, Megan test pipe. The reason I ask is because I have two friends, one with a g35 03 stick shift 250+ hp and the other with a 04 BMW 3.30ci 225hp, and the BMW, I take him out and the g35 barely beats me, so I m just curios as to why and how much hp could my car possible have gained, it took my friends and I by surprise what my car has don t sometimes

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