All right well I have been searching for a bit now for more power and have cycled thru many companys engines. RB comes highly recommended so I have picked up a R3 .12 for my NT1. Now I live in Denver, Co. so the air is pretty thin up here. My question is what pipe/manifold combo is best? I heard the 2604 works very well. Also I run 30% Werks fuel what shimming should I be at for altitude and optimal preformance and power. Lastly in what temp range to these engines run in? I want to make sure I get the most out of my engine since the competition is pretty fierce up here. Thanks in advance and look forward to finally fullfilling my need for power.