hi Neil,
my welder guy didn't say anything about EMT or welding it.........
I wondered about using that material ............but seems that it welded in
just fine.
I only ran that about 600 miles or so...........then went to a good OE type
cat.

yes........anything galvanized gives off poisonous fumes when welded.
is EMT galvanaized ?
what I used that I think is EMT doesn't seem 'that' galvanaized.

----- Original Message -----
From: "neil N" <musomuso@gmail.com>
To: "Scott Daniel - Turbovans" <scottdaniel@turbovans.com>
Cc: <vanagon@gerry.vanagon.com>
Sent: Tuesday, October 14, 2008 3:33 PM
Subject: Re: Running without a cat...?

> Not that this was being suggested as an alternative, but just in case
> anyone is tempted..... :^)
>
> I ain't no expert, but I recall asking at a metal fabricating shop
> about welding EMT. They said yes, one could weld it (in my case using
> a MIG) BUT, the EMT surface should be prepared by grinding them down a
> little at least 1" from end(s). Even then I wouldn't be confident
> doing it as I'm not certain of the metal content or depth of
> galvanized material.
>
> My understanding is that welding galvanized is to be avoided anyway.
> (nasty fumes).
>
> Neil.
>
>
> On Tue, Oct 14, 2008 at 12:59 PM, Scott Daniel - Turbovans
> <scottdaniel@turbovans.com> wrote:
>
>> a factor to consider ............a hollow can for a cat doesn't flow as
>> well
>> as  a good cat, or a straight pipe in place of a cat.
>> don't tell anyone I said this ............but a slick thing to do is weld
>> a
>> piece of straight pipe into a hollow cat.   Best flow, least restriction.
>> There's on size of EMT electrical conduit that fits perfectly - just weld
>> it
>> inside at both ends.  I've never done this of course, just heard about
>> it.