I see from your signature that you have headers. Here's just a though (since I'm spending your money here). If you have shorty headers, think about LT headers now.
Yes, it would require a new mid pipe too - so you are looking at some cash to do LT. But there will never be an easier time to drop in LT headers. With the heads off, you can literally drop both sides in from the top - no problem. And with that setup, you will be set to take full advantage of the LT's.
Just wanted to make sure you give it some thought, because this really is the ideal time to do it, and you will kick yourself if you later decide to go LT.
(I did an HCI build up this summer, and went LT at the same time.)
- One other thing you may need, an EGR solution and a programmer/chip. When you do a new intake/spacer, the stock EGR fitting won't always fit.