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  1. Wildaugust

    Exhaust Manifolds: Air Flow Efficiency?

    Every source that I've found only gives the HP manifolds a single digit horsepower increase over the original logs. So if those manifolds are not HP they likely would only be a 2 or 3 hp gain over the logs, but depending on how much they weigh, it may or may not be a very small improvement. I...
  2. Wildaugust

    Exhaust headers, Manafolds

    This is the question that I always wanted to ask. Just what is the difference in performance between the "Log" manifolds and the "HP" manifolds? So, it's a 4 horsepower gain on average?
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