dcm has it right. the 3 mentioned are much of a muchness in terms of servive, help and speed. it just comes down to personal preference. mine is the aa as i have used them for years but others will swear by the other 2 as well
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Nathan Ralls HPI, Custom Blitz,
www.piraterc.com mr-o foams
woop woop racing officialy keeping team toe out inline