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[Jorsher]

Ok, here's the deal:

I had:
header > test pipe > exhaust

Test pipe completely broke in half.  Not at the welds, the steel slowly cracked apart until it was completely apart.

The O2 sensor was on the test pipe.  The car is running like slow shit with the O2 disabled, and runs like shit with it enabled since air is getting into the exhaust at the crack and fucking the O2 readings.

I'm considering:
header > flex pipe > pipe with o2 bung welded > exhaust

Now, the flex pipe is of course the braided stainless steel type stuff.  Will I need to worry about air leaking into it and fucking the o2 sensors or should it not be a problem?  Does it matter if I have the O2 after the flex pipe?

Thanks.  Trying to get this fixed tomorrow so I can drive to trasheville Saturday and punch some hippies.

[keelay]

Should work great man. Look under the steel mesh shit next time you break one. The inside is like that cheap flex section you can buy on the exhaust isle of Vatozone.

[HiProfile]

Use the u-clamps that press all around the pipe. That and a heaping of RTV will seal any leak. The RTV will disintegrate, but leave enough gunk to keep it sealed.

I'd still recommend welding a bung on the header's collector. Any bit of outside air will skew the readings, and make it run rich.