Summit has always done me right. A power pipe will help, but you need at least 8 lbs to start with in order to see a decent difference (1lb + or more). The more boost you have before the pipe, the more you will notice the increase it provides. With regard to the pulleys, I believe the a comes pullied for 6 lbs. You can power it up, but you will be creating more heat in the porcess. More heat=greater chance for detonation. Based on your desire for 10 psi, you may want to consider starting with an s-trim. The s comes witha 3.33 inch pulley which will make 8 psi at around 5500. With an AFM pipe and no pulley change, I am seeing 9-10 at the same RPM. The s is more efficient all around, so you will be spinning it slower to make the same boost an a-trim will be working harder to create. Plus, you can always power up the s with a smaller pulley, but be sure your head gaskets, fuel system, and supporting hardware (forged pistons, loc wire gaskets, etc) are up to the task.
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