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<x-charset iso-8859-1>Sorry Jim, I know you know what a merged header is, brain-fart on me :) I recall somewhere in the murky cobwebs of my mind that an O2 sensor needs to be about 600-deg. F minimum (oh darn, maybe that was for the catalytic converter...?). Also, for us at least, this is where a heated sensor would be necessary I think. I know the heated ones are meant to get the sensor 'on-line' more quickly but I'm not sure about whether it stays on all the time. To be honest, I've never measured the temp of my exhaust so I don't know what temps come out. I know that my old stinger was all sorts of pretty colors up to the mid-point so some good heat was coming out of the header (my new stinger is ceramic coated and always looks the same). Toby Erkson air_cooled_nut@pobox.com '72 VW Squareback 1.6L bored and stroked to 2.0L, Berg five-speed '95 VW Jetta III GL 2.0L, P-Chip, Jamex suspension, 2.25" MagnaFlow exhaust, etc. Portland, Oregon, http://www.icbm.org/ >-----Original Message----- >> Key indicator, Jim, is the "QP muffler". That means an after-market exhaust >> header and those are merged, thus setting up a nice mounting point to poke >> the sensor in to :) > >Right, I understood your first comment. > >I just doubted if the exhaust was still hot enough by the time the cylinders >were merged. That's about 3-4' from the heads, and I thought that most cars >with oxygen sensors had them within a foot or so. > >I know that any part of the muffler will get hot enough to burn me, but I think >the oxygen sensor has to be at something like 800-1000F to work properly. ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe </x-charset>