New to the forum posting but have read and done searches. Aren't there an issue with the larger opening of the lower and matching it with the proper upper? I know the flow and volume of the lower is larger but wouldnt that mean the port opening would be smaller on the upper? Everything I have searched and read(Even off Overkills site) is that there is no need to port the upper but just wondering if it's worth it to buy the entire manifold setup. This is on a 2011 btw.