I bought my Probe in '05, but didn't really start upgrading stuff until '06. I didn't really have a place to work on it, the time to work on it, nor did I have much money. Also, I don't typically upgrade things until the OEM parts break. It just so happens the exhaust lasted this long & the more I searched for upgrades, the more I discovered I missed out on some good stuff! I wanted the good stuff, so I found a local guy to fab a 2.5" downpipe, but the O2 housing is a different beast. I'm really glad my friend took on the challenge & members are buying. That Aussie PMed me a while back about the 5 bolt flanges, so he may be making more. He did a heck of a job on his too, but looks much more complicated.