PS: When the time does come to remove the nut or bolt,
and you've been soaking it as previously posted,
Work the bolt/nut back & forth,
While frequently spraying the WD40.
This keeps it lubricated, of course,
but also washes the rust out of the treads.
best,
JC...

In a message dated 7/23/2005 4:30:51 A.M. Pacific Daylight Time,
Trvlr2001@AOL.COM writes:

Hi  All,
Anytime I have a project involving the exhaust system,
I start two  weeks ahead of time,
soaking all of the connectors with WD40.
Get under  there & spray every couple of days.
The heat sucks the penetrating oil  in.
& still....it aint easy !
JC...
.