Possible Exhaust leak at the manifolds. Lots of ticking.
 

I have the full SLP set up and have had it for about 1.5 years. Never had a problem.

As soon as I had it installed, I noticed an increase in "ticking" around the engine area. When I got my Stang dynoed, I asked about the ticking. He said it was fine and was "ticking" because the pre-lim cats were eliminated with the LT's.
Also, others say they have this same problem with SLP.

I don't know if it's getting worse, or if it's just my ears playing a trick on me. I'm gonna take a look to make sure all the bolts are snug like they should be, etc.

If I wrapped the LT's in that heat wrap would this help "insulate" the headers and make the "ticking" less obvious and not as loud?

sounds like you have always had a small leak to me. Thats what an exhaust leak sounds like. I would do what you said and vey first check all the bolts you can get your hands on.

I have the same problem right now what i'm doing to test this is by gas milage. I dont know if it's rubbing on something but I have noticed my gas milage go down by about 20 miles per tank.

This weekend i'm taking my mid pipe off and checking out the area down there to make sure its not anything serious. Then tighten it back up carefully to see if that takes care of it.

I can definitely tell that it's coming from the Engine area. Sounds like right where the manifolds are bolted on.

Prob got a lose header bolt.

Also check the EGR tube connections, and make sure the two hoses from the EGR tube to the DPFE sensor are hooked up. And as far as poor fuel mileage being a symptom of an exhaust leak, this is certainly possible. What happens is that the O2 sensor picks up the ambient air that the leak lets in (assuming the leak is before the O2), it thinks the engine is running lean, and commands a rich correction from the PCM.

Just want to make sure, are these all the connections around the TB and Plenum area?

The EGR tube connects between the EGR valve (bolted to the plenum) and the header (near the steering shaft). The DPFE is a black plastic deal mounted on a bracket, between the plenum and the firewall, there are two rubber hoses which connect it to the EGR tube. It's kind of hard to see down between the driver side cylinder head and the firewall, but that's where these two hoses connect to the EGR tube. If one of these isn't hooked up, you can hear it, and many times it will turn on the check engine light. Just something easy to check, but be ready to change a header gasket or two. When the engine is cold, crank it up and get your hands anywhere up there you can and try to feel for a leak, or use a rubber hose and listen for it. Good luck, bro!