I was told that the factory headers that are on the 1999-2000GT are big enough from what I was told when I purchased my MAC exhaust system. I installed a MAC H pipe Cats and mufflers last October on my 2000 GT and there is definately a vast improvment in power.
I have also upgraded to the Precision 3:73 gears and a B & M shift kit in my AOD. My next upgrade is a SC. I'm currently doing my homework on which supercharger to purchase. Any suggestions are welcome.
Thanks,
Gary
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