Supastox Mi5 Mod

[Rcracer10]

Hi,

I'm finally getting the hang of racing, and looking to improve my car. I'm gonna buy things like the alloy screw set and purple alloy nuts, but came across the 'mod' on the web. Firstly, is it worth it, does it drastically improve performance? And secondly, is it a hard mod to do, or a part that goes straight in? (Pictures of the mod could help)

Thanks in advance for all the help,

Sam