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o2 spacer...
Iv heard of using a spacer on the back o2 for non cat applications. You know, racing, etc. I was looking for one on EBay, and found 2? They had a long one, for the 2nd(back) o2 and no cat, and another short one to be used on the front o2 that claims to increase mileage a bit. I did a forum search, but couldnt find anything. I used the terms "o2 spacer" . A search with those terms on EBay will turn up both kinds. Any thoughts on this short version as it would apply to mileage?
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