This made my car sound like ass and be wicked slow off the line, don’t ever remove the rear muffler from a 16v car. The reason why I tried is because on my turbo car it sounded the same afterwards and was faster. A week later I put back on the stock muffler minus that stupid Volvo S bend at the end of the exhaust. The car is much happier being muffled. Recently I bought a welder. My exhaust is dying including the cat so in the spring I’m going to buy a Volvo replacement muffler system including cat for this car. At that time I will redo this experiment and also make up a pipe to bypass the center muffler, but I don’t expect it to end well.