well ran a Viper 17.5 at Leisure Hours Raceway in Joliet yesturday for the 2011 Presidential Race for the first time, I ran in the 17.5 and mod SC classes!!!....180 entrys 36 in 17.5 and 37 in the open class I ended up 5th in the 17.5 and 2nd in the Bmain for open. very happy with the performance. thanks to viper r/c solutions for the support!!