A pre-cat maybe? Maybe a resonator. Also, I'm not the usenet
patrol, but please post images and such in Binary newsgroups. Fewer
people will see your image if you post it on a non-binaries group,
many news servers strip the files. You could also post the image on
web space someplace (some ISPs give you some with your account) and
post a link...
A resonator is a device that's put in to alter the resonance characteristics
of the exhaust system, I believe it allows them to use a less-restrictive
muffler to cut exhaust noise.
What year is this truck?
Robert Hancock Saskatoon, SK, Canada
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