S4 / RS4 (B5 Platform) Discussion Discussion forum for the B5 Audi S4 & RS4 produced from 1998-2002

Anyone cut out precats & weld in piping as opposed to gutting?

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Old 10-27-2005, 10:52 AM
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Seems like a much easier solution. Not sure why it isn't done more?
Old 10-27-2005, 10:58 AM
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Are you on the right thread? He is talking about gutting his pre-cats...??
Old 10-27-2005, 11:03 AM
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Then why is there a big deal made over mandrel bent tubing?
Old 10-27-2005, 12:04 PM
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Default If you cut & tack welded all in a vice - the orientation shouldn't change

I don't know poop about this stuff though, so who knows.
Old 10-27-2005, 12:07 PM
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Default no relocation needed. There have been two proposals for CEL defeat recently...

moving the O2 out of the exhaust stream (somebody finally did this ... I think it was KOPork?)

Use a virtual O2 signal for the 2nd sensor that simply adds an offset to the 1st sensor. Somebody posted this recently - cost was < $50.
Old 10-27-2005, 12:09 PM
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Default I figure the gains wouldn't be much if any, but it just seems easier & cleaner -

and if/when I have a shop frankenstein-a-fy my stock DPs, I'm sure its a lot easier to ask them to weld in a new section of pipe than to gut them. If they just gut the stockers, who knows how good of a job they'd do.
Old 10-27-2005, 12:24 PM
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Yeah, I'm all thumbs as well when it comes to teh welding skills, Ian.
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