I think it looks good and would probably increase flow, however I can smell a debate on the necessity coming. My gut tells me this will help the dedicated circuit racers that see sustained loads for more than a few bursts.
If nothing more it gets rid of the stock ugliness which for some builds is dang near mandatory.
**edit**
It just dawned on me this may be necessary for part of this kit due to radiator / other size/space restraints . So if that is the case then it will obviously be useful