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Soak them good in some kind of penetrating oil, pb blaster or similar. Allow to set over night before you attempt to loosen them. You should have no problem with them breaking off, I have yet to break off a header bolt. The biggest problem I encounter are the heads of the bolt being rusted so bad that a standard size socket wont work , so I have had to go to a easy out type of socket designed to grip stripped bolt heads.
Take your time and don't force them, if you encounter one that feels like it wont budge use a propane torch and heat the head of it up, then quench it with pb blaster , do this a few times and it will eventually let loose.
Not only will it sound different but it opened up the exhaust a bit as well. The stock headers are restrictive as hell. Don't know what after market headers you used, but the stockers are about 1" diameter, the popular after market size is 1 5/8" so that really helps the engine breath a lot better.
I went with BBK shorty headers from LateModelRestoration. There are no cats on the car, the downtubes, H-pipe, Flowmaster mufflers and exhaust tips are all new. The car sounds really nice as I mentioned. It took me forever to get the exhaust tips at the back of the car to be equally gapped/spaced.
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