I just bought a '95 GSR and i have a couple of questions. First my ABS light is on, does anyone know the possible causes? And also for the first 30 seconds or so when i first start my car there is a loud buzzing noise then it stops. My cat was making a lot of noise at around 3500 rpm's so im just replacing it for the time being with a straight pipe. Any problems there? And every now and then when i start it up it takes a couple of seconds longer to start than normal.