I have one on the 370z, good bit of kit. Netted me a few HP, cant say for sure as I had my Stillen exhaust fitted first which gave bigger gains. Their trick with the MAF obviously worked though as when I had it UpRev'd I didnt make any real extra power. Pics in my "Garage" in sig. I read the development threads on the US forums and they put a lot of effort into it, trying out some 50ish different configs of lengh and diameter.