I did both the Deckplate and ISR.... I did the Deckplate a few months ago and noticed a nice increase in power (nothing amazing, but noticeable), smoother shifting, and a nice sound. A few weeks after that, I did the ISR mod and I didn't notice any power gain or any realimprovement, but there was a hell of a lot of noise so I ended up reversing that, no big deal. From my end Deckplate=Good
ISR removal=loud.(and that's about it)