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You can get someone to make a max torque header, tuned for 3-5k rpms but sacrificed top end power.
If you what a very flat torque curve from 3-7k, it's just as expensive or more expensive than a supercharger kit. you'd need header, overpipe, front pipe, midpipe + a tune. the phantom seems to be the best value when it comes out and least labor intensive to install and remove.
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