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  1. #1

    Default 98 Silverado 105,000 miles

    I have a 98 K2500 Silverado with 105,000 miles on it. I sometimes pull a 27 foot Fifth Wheel Trailer, as well as a 22 foot Pontoon boat. It has always been well cared for and garaged. My question is: What could I expect by puting a K&N air cleaner and twin exhaust from the Catalitic Converters back? Would it be worth the cost for any gain? Would I have to do anything to the Computer? I currently got 17 MPG on a 900 mile trip, empty, at 65 MPH. On the return trip, I got 16 MPG at 70 MPH (empty). Thanks.

  2. #2

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States


    I put the K&N in my burban and it gave it much quicker acceleration in the upper RPM that was it, no diiference in gas mileage. Then I added the exhaust, my truck came with a true dual from the factory so I just put a dual out magnaflow 2.5" instead of the single 3" out, I think I lost maybe 1 MPG but could feel the difference in response for sure.
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual

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