[update]: It's been almost a week since I first got the IPD installed so I've managed to put a few miles in my Turbo since then. I can tell you guys that after about 50 miles, the powerband has noticably changed for the better. Previously there was a slight dip on power delivery going from a stop but that "dip" has disappeared! Although there's still a lag from a complete stop, it's not as apparent as it once was before. The plenum has definitely worked in ensuring a smoother power delivery throughout the powerband. I would give this "mod" two very enthusiastic thumbs up!