Headers do not mess with the tune, the only thing to do is turn the rear 02's off.
Dang, was on here doing search for NA dyno graphs. Just got my 07 done Thursday(8-2) and wanted to compare on how car did. My car is an automatic 07GT with minor bolt on's. Mods are JLT air intake, underdrive pulleys, American racing Long tubes, Off road X-pipe, Magnflo exhaust. Most of the other mods are suspesion and set of 3.73...
Car made 292.72 rwhp & 306.28 rwtq Torque was actually higher than I expected.
Here is graph.
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C&L Racer, Pypes Full exhaust, Steeda CMDPs and Steeda Pulleys, Brenspeed Detroit Rocker Cams, Shaftmasters aluminum one piece driveshaft.
Not bad at all for 4.10 gears. 93 tune by Chris Tillman.
I love it
340hp/320tq
I really can't think of anything else I could add short of a SC.
Great numbers. You coming to the atco rental in october?

Not sure, have a vacation pending. When is your deadline?
Strange flow in hat header graph, I don't even have an educated opinion lol.
What gear were the pulls in?
And TopBliss, I wouldn't say those 5.0s ain't nothin' haha. They still put down more after all the money I dumped into this car hehe
Damn, I must have a really good motor. Mine went 288/310 with a Chris Rose dyno tune and a bullitt cai.. Manual trans though.