headers and reliability

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For all out longevity, nothing beats a cast iron manifold. Cheap, easy to produce making them perfect for a car designed to last 100,000 miles or more. Headers on the other hand, usually don't make it that far. Welds sometimes fail, the flanges can warp easier then cast iron. Headers tend to be alot closer to the ground, so they can get hit with things in the road and speed bumps can be a problem as well. I had an old set that would hang a bit lower and they hit a few things. My new set tucks up alot nicer as well.
 
Unless your planning on making a lot more power than stock i.e. intake, heads, blower, then the stock manifolds will work. Just replace the mid-pipe and cat-back for a nice sounding daily driver.