I had planned on using the stock MAF setup for my car, but since I am rewiring the rest of the car, I felt like I was cheaping out on the stock engine harness/computer. I had planned on getting a Tweecer, but if I am going to spend the money anyway, I feel the need to do it right the first time. What systems are in use by everyone here? Any problems? Anything that makes one stand out from another? Is one easier to tune over another? So far I have only heard of the XFI system. Can someone give me a link to read up a little more, all I can find are prices, and not to much info on the products. Combo will be a 427W/Super Vic or AFR225 heads/custom cam/TFS R 90MM intake.