Don Terrill’s Speed-Talk

To be sure, I am an amateur. These are the first headers I've built and I don't know much about exhaust flow theory. I didn't even know if I was going to be able to achieve an equal length design. I followed conventional wisdom and made the primaries 1.75" and the secondaries 2". The lengt...

I built 8-4-1 headers for my Jeep. The transfer case prevented running exhaust down the passenger side so I was stuck with a single exhaust on the driver side. The first time I dynoed them was out in the country where two brothers specialize in diesels and engines for truck pulling competition. At a...