This complete header kit makes huge increases in power output of your 5.6L Nissan. Tri-Y (or 4 into 2 into 1) style headers by design will increase the power of your motor across the widest RPM band possible. That is the beauty of the design and that is why they are the best street header available. Made out of T304 stainless steel , these headers are the ultimate in quality and performance that you can install on your Nissan!