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Well youre partially right, backpressure isnt what is important per say, but rather EGV (Exhaust Gas Velocity) but the two normally go hand in hand. However, unless you are runnin a turbo under the hood, you certainly do need EGV/Backpressure, in order to maintain a decent amount of "pull" all across your powerband. Go over on Jbody.org and see what the J body owners have found using 2.5" on their NA ecotecs for the best feedback.
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