zex is decent to have, cheaper than most out there. With very mildtuning just stay with the stage1 BELIEVE ME I put the stage 2 street/strip cam and is just nothing but idling problems and much more moreover, you will need springs, retainers replaced. I am running str 570 cam gears, because I like the fact that it has 5 bolts insted of aem with 3. The stage 2 cam I had to use my vafc to take care of it, it helped but didn't take care of all the problems. If I could I would there is a chance that I would go back to stock. When I look back on things I would not waste my money on doing things on my cylinder head and all that stuff, shootz, I wasted a lot of my time.