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havn't got any speakers around, but i'll listen to the other files soon.

here's mine for now: http://www.purevolume.com/1991miata

91 with cone intake, stainless 4-2-1 headers, stock cat, borla cat back with 2.5" piping to the silencer, 2.75" out, 3" tip.
 
Your exhaust is filled with fiberglass to deaden the sound. What you see blowing out is the excess. It will stop shortly. It will also change tone some too. Should get a little deeper.

Can you hear any difference once it warms up?
 
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