TCM Mini Cat O2 Spacer - Defouler

Construction is great and the catalytic material is a nice addition. This is being used on a BMW X5M LCI with hi-flow catted primaries and the large-opening cap appears to be working. I get a lambda delayed response - lean to rich code/CEL with the small-opening cap.

They worked as expected use the small hole tip had a cel come on and a few key cycles later it went off by itself great job on recommend parts

They work perfectly