Don't know for sure, it's probably under the dash somewhere, maybe one of the relays next to the fuse panel. I'll check when I get home and can look at my FSM. I don't know how you'd go about finding a relay that will blink faster and plug right in where the OEM one was. You might be able to make an adjustable timed relay work in it's place, but, again, it likely won't plug right into the socket where the OEM one went. That's about the best I can do. I'll let you know which relay it is and where it's at.
i think i've seen some type of box you can buy to adjust the speed of the blinkers. I'll need to look through my collection of import magazines to find it though. I personally want signal lights that blink like strobe lights. wonder would i get caught if i brought one of those 15 dollar strobe light kits from advance and put the orange sleeve over them.
haha all i did to my b13 to get fast blinkers was cut the ground wire on the left and right blinker, and then it worked. you do not have to worry about cutting the back because once you cut the front then the back will work too.