This is proof that NA tuning CAN make power. The dashed line shows the 350z as I recieved it as a Grand-Am GS racecar with Motec, headers, exhaust, intake – the whole bit. Over the years we have changed the cams, ported the heads, changed the headers, fabricated a new exhaust system, tried MANY different intake set-ups (the current setup enjoys Jenvey ITBs), and raised the compression. While each of these changes resulted in relatively small gains (sometimes no measurable gains), the end result is over 80whp over the engine as it was received. Incredible!