Re: My car makes less power now
Something has got to be wrong,the intake is the only thing I couldn't get enough info to determine about what kind of increase you should be getting, but you should easily be making 330-340. If the intake is the one I was looking at, it's designed to take forced induction, but that shouldn't degrade performance while naturally aspirated.
I would try swapping the intakes to verify, if the performance is the same, something must've went awry in the build.
Chewing on asphalt and drinking dinosaur wine