SD Performance spec'd and supplied all the correct components. Check out SDPerformance.com - I have a testimonial written on their web site under Customers Rides. These guys did a awesome job working with me to spec out what was right for me...not just some canned solution. In addition I took advantage of their 5 axis CNC porting capabilities. My "Stock" 6X heads now flow 280 cfm!!!!Check Out SDPerformance http://sdperformance.com/customerCars.phpI highly recommend a full roller cam system - its worth the extra $$$. Great idle and the power brakes work at idle...what a concept!