A picco .21 Evo 2 or 3 off road or Jammin JPX .21 plus will be a massive leap up for you.
Highly underrated, overlooked engines.
I have the JL .21 coming anyday now, with a full Extreme Racing Mod....stay tuned!
Box stock the JL was extremely smooth and stupid quick from mid to top, before I even tuned it. I only ran one pipe and 1,000cc's of fuel thru it before sending it off.