if you have the time definitely read thru it. There is a lot of great info regarding FJ exhaust systems. It's easier to screw up the exhaust than it is to get it right. BAmufflers only exists because there weren't any options for my Tundra that I didn't like, so I made my own. Then I went down the line with nearly every Toyota truck and came up with a solution for the average end user to customize the sound of their vehicle.