Hard to see in the picture but the HT hose is larger on one end. I didn't measure, but the inside diameter is about 3/4" at the large end and about 1/2" at the small end. I didn't use metal tubes as my aftermarket crampons didn't have air channels. Instead, I got an O2 socket with a plug. Welded the male, drilled and tapped the male for 1/4 NPT, used an elbow and a 1/4 pipe nipple with a plain thread on the end that goes into the hose. My dual exhaust now passes the mandatory visual emissions control.
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