I completely disagree with this comment in regards to the pedal boxes and assume you must have never used one. Although i dont feel the need for one on my current Mk7 GTI, i had one on my previous Mk6 R which made a significant different to a rev hang issue it had when changing gears (manual gearbox), and fitted one last year to my Audi SQ5 as it had a horrible throttle delay taking off from a standstill. In both instances the pedal boxes have made a noticeable difference and improved the driveability and response of the car.
Hiclones on the other hand are garbage and only idiots who know nothing about engines would have bought one of those thinking it would increase performance or give better fuel economy.