the exhaust is pretty efficient on the N/A, not sure about the intake. just get a 2.5'' back (any bigger and you sacrifice low end response), and leave the manifold alone, i've heard that headers are a complete waste of time and money
welcome to the forums,
i can already see that you are going to be spending, ALOT of time here.
it sounds like you might already be developing a blown headgasket from the noise behind the dash; that sound is air in your cooling system.
are you sure the previous owner did a rebuild on the motor?
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