Hello got the slash 4X4 I broke i shock so I upgraded to the Big Bores. I notices that the BB are actually thiner than the stock ones so I could not use the stock springs. I want to build a concrete high speed Slash!!! so what springs can i buy that will fit the BB shocks?? I want harder suspension I am running the white springs with red line Also any tunning tips for concrete slash i will greatly appreciet it!