newbie here with a question. i have an 08 SES sedan, auto trans, with about 3500 miles on it. only mod to date is the throttle body ground. i am considering a steeda intake and a trubendz exhaust. ive been practicing hypermiling and on a good day, have hit 40.8 mpg. it usually averages 33-39 mpg. just curious what kind of improvements i can expect or notice by adding the exhaust and intake. this car is my everyday ride, and i wont be stomping on the gas. thanx in advance.