If you're chasing a timeslip then yes it's worth it. If your just cruising on the street then probably not. I picked up a couple tenths going from 2.5 full mandrel bent to 3" from manifolds to mufflers w 2.5 tails. If I had it to do over I would go all 3 but was concerned with fitment around the 9" rear.
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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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