Looking for more 408 pull at the big end?

MichaelB. said

If I were to tune up something (other than the driver) for more top end charge what would you go for 1st?

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You mention "Tune up", not "start replacing"... I'd do as "replicaracer43" mentioned, then I'd "add" a cold air intake. And dial it in some more. Unless you got money to burn!