one of my friends has a 99 civic si coupe 5 speed and all he has is an exhaust. will i be able to beat him. i have mac headers, bosal hi flow cat, flexpipe, magnaflow 2.25, volant cai, fc 65mm tb, autolite dbl pltm spark plugs, and 8.5mm spark plug wires. i was wondering, what octane gas do you all use? i have always put 89 in mine. should i go up to 93, use 87, or still use 89?