Re: Magnaflow direct fit cats
probably wouldn't cause issue, it didn't for me, but i thought the better informed you are couldn't hurt. i thought those flanges were the right size and i was screwing something up for the longest time, but that wasn't the case. also, i tried to swap my O2 senses as well a little while back, but when i got the old ones out the threads were so chewed up it left bits of metal in the threads of the bungs. this also caused a bit of a leak, but its pretty much welded itself back together now.