hahahaha...bolts ons on an automatic teg will be running mid-high 16s.
the automatic is crap when it comes to applying real power. im speaking from experience.
yes the mods are a bit noticible, but not worth it in my opinion. you can spend $150 on an intake, $350 on a header, $400 on a catback system. you will still get beat by a stock 5sp.
i think from 0-60, the manual is a whole second quicker than the automatic.