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  1. 3rd Generation Altima (2002-2006)
    Hi, I have a 2005 Nissan Altima 2.5S, I recently replaced the pre-cat header with a new aftermarket header for better performance. Since the. I have heard a strange whistle whenever I accelerate, to me it sounds like a gurgling whistle and it seems to he more pronounced when it shifts into...
  2. 3rd Generation Altima (2002-2006)
    Hi - Just bought a 2002 Altima SL with the 2.5L engine with 137,500 miles. My wife & I really like the car, it's comfortable & the I really like the styling. But, I honestly don't know if I would have bought it if I'd known about the pre-cat problems. What I've read is a little troubling...
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