Had a very pleasant experience with these folks during the past couple of weeks...
Bought this cat last year along with a complete ss magnaflow xhaust sytem and, after nearly completing a frame-off, am readly to install all of it.
That is...until I noticed the cat had no bung for the downstream O2 sensor. Called Magnaflow, told them what I had, they said to take it back to 4Wheel Parts for replacement.
New one comes in - no bung.
So, I talked with a young man by the name of "Derek" at Magnaflow who checked with his manager about the issue, they pulled the drawings and, sure enough, the drawing for p/n 29237 shows a bung. All of 4Wheel Part's stock, however, came w/o the bung installed.
Magnaflow told 4WP to ship the converter directly back to them and Magnaflow then shipped a correct cat directly from their own stock.
Might want to be aware if you order the SS Direct Fit Cat from 4Wheel Parts.