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Thread: 2.5 dual exhaust bottleneck?

  1. #1
    Junior Member SHOW GUEST
    Join Date
    Aug 2007
    Fort Collins,Co

    2.5 dual exhaust bottleneck?

    Hi, kind of a dumb question but sometimes you gotta ask. I have a 410 ci engine I rev to 6500, looking for at least 550 flywheel hp. The headers are big enough but I don't know about the rest of the exhaust. It's dual 2.5, mandrel bent back to two Magnaflow round mufflers. Would I see that much difference going to dual 3 inch? The motor doesn't top end like it should and I think the exhaust is plugging it up.


  2. #2
    Administrator RACING JUNKIE bjuice's Avatar
    Join Date
    Apr 2003
    Greenville s.c.
    what size are your headers ?..2.5 mandral bent is still pretty small...your mufflers could also come into question..where do you have them mounted..test have showed the closer to the rear you mount them the better.

    off the bat i would say a minimum of 3 inch exhaust..

    now there are other things that could be a result in poor top end also..Gear,camshaft,Carb etc......but i would start with exhaust


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