Cletis:
Just read an ad in Classic Trucks Feb 2011 issue you might be interested in. Dynamite Dumps..Sound Suppression inserts. Made to quite pipes and increase power etc. Web site is...

www.carchemistry.com

Don't know if it will fit your application..just thought I would share the info I saw.
Take Care

1954 Chevy 3100 5-Window
In the Stovebolt Gallery
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"True victory is victory over one's self."
Krav Maga isn't pretty ... but it works just fine.

Jimmi V.