Okay, the car is getting closer to completion and I have a problem. I installed a Magnaflow X-pipe with cats and American Thunder cat back system. Now the car has a whine sound coming from the engine are maybe?? but it goes away at higher RPM. It really does it most at start up and sometimes at stop lights. The motor is completely stock but will be getting pulley's, plenum, and cold air soon as well as shorty headers all in the next few weeks. I need some help though, what is the whining sound? It's a dull whine and not a high pitch brake squeak type whine. By the way it is an automatic and I hear a loud whine when the back seats are layed down but not hardly when they are up-something in the rear? I need help before I buy more mods.
thanks
Rob
thanks
Rob
Sounds to me like some belt slippage or maybe the alternator starting to go 
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