i recommend headerback if u really want the power. and go with 2.25 inch piping. i was running a 2.25 inch apexi N1 catback with a 26inch resonator on my coupe when i had my single vtec, cuz i wanted it quiet.. but now that im runnin ls vtec i kept the piping size but had it mandrel bent, i did headerback instead and removed the resonator. i would recommend something thats mandrel bent like mine, and not welded up. if you have the money then thats your best bet. u get the sound, power, and your car will breathe wonderfully.