Well i run a series 2 in my old buggy for 5 years but it was stockish. Everyone says i should have put a 5.3 or 6.0 in it but the power of a SC3.8 is Awesome from a dead stop which comes in great for limbing up vertical walls. I still think i can take a 5.3 or 6.0 thats stockish. I am taking my new buggy to 1/8 mile track this friday, will see what she runs