AFE Stage 2 Intakes & Exhaust Combo

I just bought an 07 taco crew cab short bed about a month ago. I absolutely love it plenty of power and pretty damn good on gas. I wanted to give her a little more bark and possibly a few more mpg. I was looking @ AFE Intakes. Can some one maybe tell me the advantages or what they think is better between the stage 2 CX intake kit and the stage 2 Si intake kit?? I noticed the stage 2 Si kit is about a hundred dollars more. And how about the Pro Guard 7 filter is it worth the couple extra dollars???????? I'm not real crazy about their oil-less filter either. I was thinking of pairing this with an MBRP dual exhaust or an Magnaflow single cat-back. Again the Magnaflow is about $100 more but I think it will have a nicer throaty sound. Just wondering if anybody has either of these exhausts or intakes & what their recommendations to me are and what they think the best performance will come from in this combo.
thanxs,
sauce6969

 

I have the magnaflow cat back with the afe pro dry s drop in filter and personally lost about 2 mpg but did fell like i gained some throttle response and by the seat dyno a few horses