At what point will this be worth the $. I have minor mods on an 06 coupe. K&n intake,corsa exhaust,high flow cats,3:73 gears,soon to install light flywheel,stop tech rotors,forge line wheels,ps2's. Will a re flash be very beneficial, will I notice a difference? Also, if I'm having the flywheel done, is there anything else I should have done while it's being worked on?