[BOTTLEDUP]

Leave the headers you have Shannon, I seriously doubt you'd notice enough of a gain to justify the change.

FWIW most of you know I fitted Difillipos to the TE along with bashed out cats (as received, it wasn't me officer!!), on the dyno we gained horsepower above 4800rpm, approximately 5hp by 6000. Below 4800 it was behind the stock headers and cats. Recently I had the original pipes refitted as I return the vehicle as close to stock as practical and the improvement in throttle response and torque right off idle is most definitely noticeable. 'Seat of the pants' feel rarely corresponds to a dyno figure, as a dyno cannot measure throttle response or rate of acceleration, and this is exactly where smaller diameter high velocity pipes (headers and cylinder heads as well) really shine.