I want to see numbers after the magnaflow, no pre magnaflow. These things are likely only worth 10-15 right? I asusme they did the stock setup first knowing they could advertise a 30+ gains and not be "lying".
You aren't following me. There are dyno's showing a manganflow exhaust giving 20hp/tq at the rear wheels. This would mean your headers are only worth 5hp and 10tq. You did the additions in reverse order to give a false impression of how much hp/tq they add.
At this point, I want to see someone who added the magnaflow exhaust and had it dynoed, add these headers and then do a dyno. I have a feeling they will struggle to break into the double digit gains. Care to place a bet?