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Discussion in 'Trucks and Trailers' started by 84'GMC4x4, Jan 5, 2001.

  1. 84'GMC4x4

    84'GMC4x4 LawnSite Member
    from MA
    Messages: 84

    well, i've pretty much resigned myself to putting cat's on my non-cat truck so it will pass the MA state inspection emissions test.
    flipping through my Jeg's catalog i see Dynomax super converter's. they have 2-way converter's for $119.99 and 3-way converter's for $50.99.
    my question is, what is the difference between the 2-way and 3-way converter's? going by the old axiom "you get what you pay for" i'm assuming that the 2-way is better in some way, but if anyone knows why i would appreciate any insight.
    i also have headers into straight dual exhaust if that makes any difference.

  2. roland26

    roland26 LawnSite Member
    Messages: 16

    talk too the local inspector and ask him what you have too have to pass. I cat or two. I have a 84 with hedders, a complete 3" system (single). I ordered a 3" hi flo cat from summit,ask them they will tell you. I also use a 3" hooker maxiflow muff from summit. nice sound. I was having trouble
    with the way the truck was running. after the change to the hi flow cat, hooker muffler, and a 4"k&n air filter. the truck came alive. roland
  3. John DiMartino

    John DiMartino LawnSite Silver Member
    Messages: 2,555

    If you plan on keeping the Cats on after the inspection,make sure the ones you get are rated forthe GVWR of your truck,cheaper convertors arent meant for high GVWR trucks,you need a truck convertor,if you tow,or eventually you will experience a meltdown of the convertor.
  4. Vandora Lawn & Landscape

    Vandora Lawn & Landscape LawnSite Senior Member
    Messages: 386

    In maryland, if a repair doesn't fix the problem, a waiver after the nonhelpful repair lets you skip emmisions tests.

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