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I have an H23 and decided and have the same cat ur looking at...i am not sure, but the place i went, all the cats had the O2 bungs...so i just told them to cut and weld it, since i didnt need it. I ended up going with 2.25 cuz i beleive thats the same size as Greddy piping. FYI...It is NOT the same size as DC downpipe. DC is a little smaller.
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