I was hoping to get the 20" STs for my car but Dynomax told me they start restricting power at 376hp. I ended up with the Ultras which sound great but drone. AG has your brother taken his car to the track?
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Chris D
69 GTO Liberty Blue/dark blue 467, 850 Holley, T2, Edelbrock Dport 310cfm w Ram Air manifolds, HFT 245/251D .561/.594L, T400, 9" w 3.50s 3905lbs 11.59@ 114, 1.57/ 60'
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