Quote:
Originally Posted by CigaR007
An aftermarket header, depending on the type (4-2-1, 4-1) can help with low-end to mid-range torque allowing for more efficient acceleration and cruising.
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I agree. Headers are more efficient by design. They are not installed from the facory because they take up more space and they generally don't last as long as cast iron manafolds. They can rust though quickly if not cared for. If they are showing any signes of rust, wire brush them and spray with header paint.
The only reason I would mess with it is if the aftermarket pipe is significantly larger (more than one size) the stock. Some people want go way too big on aftermaket pipe, reducing back pressure too much. Usually a reputable installation shop will talk sense into people before they make this mistake though.