[laserspeeddemon]

Remove the down pipe. Depending on your after market exhaust pieces, the size of the bolts can vary. I have shown a typical 2 bolt downpipe flange for DSMs. Remove the O2 housing-downpipe bolts. Remove the downpipe-cat/test pipe bolt. Remove the Down pipe. These are typically 14mm on the cat.and 17mm or 19mm nuts (circled in blue).

Note: Due to the postion of the down pipe, it was hard to get a picture of the bolts/nuts with the downpipe on. The pictures below are shown with the downpipe already removed and is just a reference to thier postion/location.