Another way is to take off your front bumper, and then remove the resonator. There are a bunch of bolts holding the front bumper on that are visible. Only 4 bolts are difficult to reach without an extension. After you take off the bumper, you will see a black box with tubes around it. Take off 3 screws that are holding it in. Two are visible and one is in the back. Pull the resonator down and out. It will be connected to a butterfly valve (disc/ufo/silver thing) and there will be a black tube connected to it. Cut the tube at close to the valve on the resonator. Either plug that tube up or tie the tube tightly. Put your bumper back on and you are ready to go. It doesn't do much in HP but it gives a somewhat decent growl when revving and at WOT. Check
www.ntpog.com and
www.hondaprelude.com for more information. NTPOG has the resonator removal with pictures to get you familiar. It's under the DIY Mods. HondaPrelude.Com has a good article on how to remove your front bumper (Check how to install the JDM headlights to remove your bumper). Good luck