Well I got my full exhaust installed today... Itr 4-1 header, hiflow cat, 2.5" piping, and apexi ws2 universal muffler. At first no resonator was installed, so when i tried it out, it was wayyyyy too loud for me... then I went back and he installed a resonator and it quieted down a lot. The only time it gets really loud is when vtec kicks in. I don't mind how loud it is, but I was thinking it would be a lot quieter.