having driven them i do find them a big advantage, mainly over the bumps and especially when landing off jumps. the car has a far larger safety window meaning you dont have to be quite so acurate all the time. for the average club racer i can see this being a big help. as for weather they improve a laptime is another thing but they do help to gain consistency in a run so you can get more of your quicker laps
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Nathan Ralls HPI, Custom Blitz,
www.piraterc.com mr-o foams
woop woop racing officialy keeping team toe out inline