thats very good idea. simmalar to Warlock mufflers
this guy did almost the same thing you might want to check it out
http://www.mustangworld.com/ourpics/fcar/cutouts.htm
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1990 Dodge Dynasty with 275,000 miles. Mods:chiped paint, CD player. Sucks but it was free. Praying for a stang.
The "Guetto Glider"
P.S. watch out cobra owners it's a freak