Re: New exhaust but weird fart noise when it shifts?
What your hearing is the computer shutting off injectors when the transmission shifts. It does that to make the shift smoother. That along with a muffler that is probably pretty much a straight thru design magnifies the sound. I used to get the same thing with a Lincoln i had that glasspacks on it. It would fart when the engine was turned off. I've had 3 PT'2 with manual transmissions and when you coast for a little bit the PCM shuts off the injectors to try to save fuel. It would actually be louder than when the engine was running sometimes. My 06 GT sounds really good when it does it.....
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