Nice numbers! I had the same issue with the Predator and ditched it and got a custom tune loaded into my ECU...When they first loaded it to my car it went way lean and once they got the A/F fixed the predator wasn't allowing my car to produce any power after 5,800rpms...the power was dropping off a cliff.
How is the low end power in your car? Mine does not exist before 3,500rpms. I guess that's a common problem when adding catback and mid pipe, but I'm getting ready to install Pauls High Performance Intake Spacer to maybe get a little low end torque back....LOTS of people on the registry have done this mod and say it may only give you 4 rwhp & rwtq peak numbers, but it will give you added power throughout the RPM range.
You will for see some gains from the mid-length headers vs shorty's....that will be bad azz.
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