im watching this thread with much interest as i also have gt4 although mine is an jdm version and im doing the same to mine, just changed full exhaust, plenum chamber spacer next, what mileage is yours mate,,
just clocked 65k the other day buddy and i might get headers im not too sure as yet, i have fit some facelight rear lights today though so ill put up a pic later, they really do make the back end look so much more refined
Karl