I went out to race a friend of mine last night just for shifts and grins and when we were racing after I would hit about 4500 RPM all my lights would dim (inside and out) and when I would shift at redline the batt. light would flicker. So on my way to work tonight I tried it again. Same ****. happens with or without the radio on and it did not happen in the day time (no headlights). The car starts right up every time so I know the batt. is holding a charge. Do you think I need to change my alternator? What do you guys think?