Banks did the design work years ago. It's no longer available to buy from them at any price - I tried and they won't make it. Which makes no sense since they already have the engineering done, but whatever. I have a copy of the marketing piece they did for it somewhere. If memory serves, they had 70 HP and 85 lbs of torque on the dyno just from installing their exhaust system. I have the specs on it and will be duplicating when I rebuild my engine.70hp from just exhaust? That sounds more than a bit optimistic, to me.