Originally Posted by wstar

Given the evidence we have so far from independent mod dynos on these forums, 18 (or more) HP from any reasonably well-designed intake and cat-back is pretty much a given. The stock exhaust on our 370s is total crap, and a poor match for the engine's capabilities, basically. The theory I was adhering to earlier was that they did this to lower the HP specs on the 370 to make the GT-R look better in terms of $$/performance. Now I'm thinking more like they did it to make the NISMO edition look better.