Looking to add some more hp without spending more than $500. Look at my mods so far. It put out around 396 rwhp and 380 rwtq when it ws tuned but that was when the car had 1000 miles on it. It's now at 5000 miles and feels significantly quicker. Should I go with a new throttle body, port my TB, add a bigger air bridge, or something else. Definitely No Nitrous. All suggestions and reasons for your suggestions are appreciated.