Our Xheader is a design that is
suited to truck and tractor pulling better than any header on the market. The unique design uses the exhaust pulses of one cylinder to help fill the next cylinder. With the dyno results we have seen you will get a improvement in hp and torque and not have to give up one for the other. After other designs peak we have not seen the peak in the Xheader even at 9000 rpm that is as for as we took it. We are still offering the 4 into 1 for BBC only for 1249.00. All others slightly more.