does anyone know of a aftermarket throttle body would cause power loss for my stock b18b1 the stock one i have on is 60mm and the one that my friend has is 65mm would it even work on the stock intake manifold?

 

It could more than likely lose power but it definitely won't give you any power GAIN. If I were YOU I'd leave the stock part on unless you're planning on port matching and tuning for the new part.

 

the thing is my tb thats on my car right nowthe idle screw is striped and the car has no idle and my friend said he would give me a 65mm eddlbrock tb with a new gasket for 50$ one hell of a deal i can tune my car myself with chrome