There is no gain on going true duals with the power you are making right now. The 3" system flows sufficient enough for what you have now and if you make more power in the future.
My advice would be to fix the exhaust you have now.
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2001 Trans Am WS6 •SLP Loudmouth II •UMI Suspension •12.857 @ 109.57
1996 Trans Am WS6 •Pacesetter Longtubes •Strange 12 Bolt •Spohn Suspension •11.152 @ 123.85
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