Not all modifications made to the bike has to make sense or have positive gains to the horsepower or looks. Well, this speaks pretty much about this modification then. The addition of the grab rail to the rear would not make the bike more aerodynamic and the additional weight from the chunk of metal will just bog the bike down.
Aesthetically, I would think that there's any difference. So why do it then? Well, 2 main reasons.
- I'm too free recently
- The grab rail is totally not utilised at all, lying around at home
Additional of around 2kg of dead weight
Maybe can pass this off as a spoiler.