Everything on the exhaust of my 88' FJ62 from the cats back was rusted through and cracking. I took it to a local muffler shop, had them put on 2 1/2" exhaust on from the cats back, with a Y pipe and a single Flowmaster muffler. The increase in pep is noticable, but not overwhelming. What has impressed me more is that my in town MPG went from 10-11 to 13.5 on my last fill up!
Next - some top end work...
Next - some top end work...