Hey, I'm hoping to upgrade my savage x 4.6 engine soon. Any ideas? Id like an engine thats easy to tune but has a good amount of low end power. I currently have the hpi ribbed pipe on my truck. I'm thinking lrp .28, lrp .30, or lrp .32. Any other good reliable engine ideas? Also would my rotostart work or do I just need to use the pullstart that comes on the engines?