There are a number of variables that play into the sound of the exhaust. I forget off the top of my head what the cut-off was for all Eclipses being Cali specs, but if you do have one, you're now running a conventional cat and a hi-flow cat. The front cat is probably doing more to quiet your car than the resonator. Typically, resonators help produce a low, mellow tone instead of having the riced-out "pissed off bumble bee in a coffee can" sound that the Honda guys love so much. Removing the resonator may increase the sound level, but will probably also make it more high-pitched.Hello I have a 02 eclipse GS and I have got a evo-II catback with high flow cat but somehow i want the sound to be much louder than wat it is now....do I have to do something with the resonator??i mean do i have to remove it...???
He has a GS (4G64 - 4 cylinder)...the dipstick is in the back...:ugh2:You will get a little more rumble with no resonators since you already have a high flow cat. I did that to mine, but I still have the two precats wich Im sure its robbing me more grrr sound, I don't want to mess with them until I know how to deal the O2 sensors. Mine is a Cali spec, so check yours, do a search to find out if yours is one, or if you see a heat shield (small catalytic converter) right in front by your oil dip stick then you probably have Cali. Good luck!