I just installed 4 Infinity speakers and I would highly recommend to anyone considering this upgrade to do so . There is a much better balance with all 4 being upgraded . I did not have to cut the rain basket , I used the mounting ring supplied with the Infinity's and it worked fine . The mounting ring is first connected to the rain basket and both are connected to the door using the same screws supplied by Acura . The speaker's are then connected to the mounting ring . The wiring harness aren't necessary but I would strongly recommend using them . I'm also installing a Polk woofer in place of the factory woofer . I noticed that there are alot of mid's and vocals coming from the factory woofer , does this clean up any with an upgraded Polk woofer ? :1zhelp: Should I also install a crossover with the woofer upgrade ?