a mechanic mentioned if i did this mod. it will really improve the performance of my 86gt, he claims my cats are probblly pluged up after 160,000 miles, i did my last emissions test , so no more cats . what do you guys think?
When I had my factory h-pipe a long time ago, I got a steel rod, sharpened one end like a standard screwdriver, and used it with a hammer to break out all of the material from inside the cats. Nice sound, and no more plugged H-Pipe, and, best of all, free.