[Bill Verburg]

Originally Posted by r lane

For a track car, 3.0 engine, 11.8 to 1.0, D60 cams, MFI, twin plug. What size header do want for that set up, OD/ID. Thanks, Bob

What's the rpm range, muffled or not



but most likely 1 5/8" ID which is ~1.75" OD