Throttle Controller (APEX) – This is an amazing mod... One of the best mods I did to my car. It allows you to control the sensitivity of the throttle. While it doesn't technically add any HP, because of the sensitivity of the throttle, it feels like you just added 50 HP. It is complete plug and play and should take anyone about 10-15 minutes to install it. Retail is $289. Selling for $200 OBO.