well yesterday i took my car to the greatlakes dragway for the first time and i was running 17s i couldnt believe it .i have a 95 gt convertible and its auto.i also have mac LT headers,mac ORH,magnaflow magnapack mufflers,K N air filter.my best was 17.00 @80mph.what could be the problem.any help will be very helpful.thanks for anyone that helps me out.