Dazed and Confused
Join Date: May 2012
Location: Upstate New York
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.
Ever notice that there's so many high performance parts available for GM products?
Did you ever think that maybe they NEED them?