I would honestly get an intake manifold insulator. You can get either the MACE or the RX one. The MACE one gives you better low end torque gains and pulls hard all the way to redline. The RX one gives more top end horsepower. I have the MACE and love it! It makes a huge difference.
You could also get a MACE Ported Manifold. Its 625 with a core charge but you get 300 of that back. Don't know if that's in your budget but it's easily one of the best bolt-on mods available. I have it and it made a world of difference in how the car feels and boy does this car fly now
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