I just installed the headers, mid-pipe and muffler from delubozparts on my '00 Boxster S.
The install:
I bought the "factory second" headers with one O2 bung in the wrong place. Since I have only one set of working O2 sensors I thought this would be no big deal. I had a lift and removing the old exhaust was easy, it had been off the car 6 months go. The headers would not bolt up without massaging the holes in the header flange. After some minor grinding, the headers bolted up. The O2 bung on the driver's side was OK but the wire needed to be extended. The header flange is too close to the brace and occasionally hits it lightly. This happens when slowing down or sometimes at idle. The passenger O2 sensor tilts down more than I would like, but I don't think it will hang up on anything. It needed the wire extended as well. The mid-pipes fit fine. The mount for the exhaust needed some massaging of the mount so that it was not binding. About 4 hours to install with a full shop at hand.
Impressions:
The sound is amazing, sounds like a GT2 RS. I got no drone at any rpm. On the highway, the wind noise is still louder than the exhaust. But when I put my foot into it, the sound puts a huge smile on my face! I'm no kid, 55 and gray

Driving like I usually do around town (short shifting below 3000 rpm) would not attract any undue attention. 80 mph is about 3000 rpm and no problem hearing the radio over the wind noise with the top and windows up. Windows and top down, you won't hear the exhaust unless you wind it above 4000.
Conclusion:
For the money, you can not beat this exhaust. The shop that did the work was so impressed with the value. They could not believe what I paid for the whole exhaust. They said they will be ordering some for their cars. They were paying, for headers, twice what I did for the whole exhaust. The minor fitting issues were worth the savings.
Final Thoughts:
I wanted to do a dyno run before the headers went on, but the dyno shop next door opened late today so the headers went on without benefit of the baseline run. I will be doing a run before I install Pedro's TechnoTorque II. The only real complaint is the clearance between the header flange and the brace which rattles sometimes. I will clearance that when we do the TTII.