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Got an 04 Neon, LOVE IT! Got it back after loaning it out and theres a loud brrrrrr when I accelerate. It's not the trans, it runs fine... its not the engine. It sounds as though if I did have a tip on the muffler but I dont. Other than this constant noise when I rev, it runs perfect. A friend around the way said catalytic converter. Any suggestions? Recommendations?