Just build a 421 serval!!! Great for the trails. But if you want to start small get some pipes. I had some toomey t5's and I loved them. If you don't want to do a 4mil right now just get all of your bolt ons for it ( vforce reeds, noss cool head, +4 timing, pipes) and then when ur ready to go 4mil you have all of that already bought. Trust me tho 4mil is the way to go