Agreed with quicksilver, injectors aren't going to add much, just take more money from the wallet. Have you considered solid motor mounts? Underdrive pulley? The solid motor mounts are about $30 and worth every penny. I also have an 03' non-turbo, and the motor mounts made the biggest difference vesus the intake and exhaust. Also take a look at new plugs and wires. The new GT manifold is something else to consider, along with a 4-2-1 header.
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