To do it on that kind of boost I would be going a full exhaust, injectors, a walbro intake pump for safety and either a Rapid V3 kit or the Process West Stage 3 kit. You may possibly have to upgrade the actuator and get the flapper mod. Valve springs are a must as welll because it is a BA and they won't handle 300. Obviously if you just do the cat, injectors and valve springs and a cooler but it would take more boost than that to get to the mark that you would like. As for what cat to use I would go with either a Hurricane or a 5 inch Ballastic cat.