The exhaust note in my '95 540 sounds like a deep V-6. I took the muffler off and replaced it with glass packs, which just gave me a louder, deeper 6 cylinder tone. I noticed there is a large device between the muffler and engine in the belly of the car. I assume it's the catalytic converter, but it's very large and might house another muffler. Has anyone got ideas on how to get an 8 cylinder sound out of this car?