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Making Exhaust Louder. Replace cat???

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by dawson444, May 15, 2001.

  1. dawson444

    dawson444 1/2 ton status

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    I have a flowmaster 40 series in my truck, but it sure doesn't sound like I have one. I think my cat may be my problem. Would that make my exhaust so quiet? What should I do? Get a new one? What kind/model? Can't you get them like cleaned out or something? I thought thats what I heard. Thanks!

    Dawson
    Raleigh, NC

    88 K5, 4" lift, 33" BFG muds
     
  2. Mud Bath

    Mud Bath Registered Member

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    hey, i got a high flow converter from some muffler shop out of california. it was 3" inlet and outlet and only cost about 60 bucks. dont remember where it came from though. they had it on an ebay auction but they also sell right out of the store. i dont even know why mufflers are put on trucks with converters i took my glasspack off and it wasn't that much louder than stock. get a high flow one.
     
  3. solowookie

    solowookie 1/2 ton status

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    hey, try some headers...

    I got hooker hearders, no cats (sorry thats probably not an option for you), and true dual exhausts w/ 40 series flow masters! man everybody loves the sound, and I think my mechanic drools everytime he hears it. says it the best sounding rig he's heard...

    it's a bit load for me, and I am considering going to 50 series... I'm gonna rhino line the inside first before I decide!

    <font color=blue> Jeff </font color=blue>

    [​IMG][​IMG]
     
  4. ChevyCaGal

    ChevyCaGal 3/4 ton status

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    I think the place he's talking about on eBay for the cat is mufflertech? I have seen them on there....they are in CA. In fact one is like 1 mile from my house! Try them they are decent....You can also make some noise with headers...I also have heard that if you flip the top on your air filter housing so it's upside down it makes it louder. I never tried it, but some people swear it works. Might try it to see what it does?

    "Suck Fumes Ford Boy"
    "I love my country, I fear my government"
    <A target="_blank" HREF=http://www.chevycagal.homestead.com/steph.html>http://www.chevycagal.homestead.com/steph.html</A>
     
  5. wayne

    wayne 3/4 ton status

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    I just put a catco converter and flowmaster force 2 system on my 89 last week. I like the sound of it. It is mellow at idle but roars when on the skinny pedal. I got it all at Summit Racing. Their phone # is 1-800-230-3030.

    <A target="_blank" HREF=http://jamonline.homestead.com/fromthegroundupK54x4/89Jimmy.html>http://jamonline.homestead.com/fromthegroundupK54x4/89Jimmy.html</A>
    <font color=blue>Happy Trails<font color=blue>
    <font color=blue>Wayne<font color=blue>
     
  6. Blue85

    Blue85 Troll Premium Member

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    yes, a 40 series Flowmaster will holler with the right setup, but your cat and manifolds are choking it back. The factory "Y" crossover pipe doesn't help that much either. If you put on headers (other than shorties) you will need some muffler shop mods to the front of the exhaust. If you replace the cat, you're probably best off in the muffler shop as well, so while they're torching and bending, you might want to make some changes. Maybe you'll want bigger tubing from the headers to the cat, for example.

    Chances are that as your exhaust gets louder, you will gain MPG, but if you open it up too much (i.e. 3" pipe everywhere), you will start to lose low end torque.

    The best sounding setup possible would probably be some good headers into high flow cats (my high flow cats happen to resemble aluminized pipe for some reason [​IMG]) to a pair of flowmasters with pipes coming straight out the back. Having a longer exhaust will help to bring out the killer low note. I think that this is helped by placing the mufflers closer to the back of the vehicle, but I could be wrong. The less bends in the pipe after the mufflers, the stronger the sound will be.

    Never bolt on one of those 1 1/2" do-it-yourself kits unless you want to sound like a stack of firecrackers in a coffee can.

    <font color=green>"I don't have the brains for business. I want to go into politics" -Mao Xinyu </font color=green>
     
  7. ChevyCaGal

    ChevyCaGal 3/4 ton status

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    If you go with Edelbrock TES headers or the Hedman TES setup they come with a Y-Pipe that goes back to the cat....

    "Suck Fumes Ford Boy"
    "I love my country, I fear my government"
    <A target="_blank" HREF=http://www.chevycagal.homestead.com/steph.html>http://www.chevycagal.homestead.com/steph.html</A>
     
  8. Nrose07

    Nrose07 1/2 ton status

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    I've got stock manifolds, 2.5" primary going into a flowmaster Y-pipe then going to a single 3", Flowmaster 60 triple chamber w/ Delta flow, and finally exiting out the drivers side corner. LOUD LOUD WAY TOO LOUD. BUT perfectly quiet while torque converter is locked up in OD. I'm thinking of a high flow cat, don't have one right now. How much is it going to help? Thanks

    Displacement, cubes, and did you say you drive a riceburner???
     
  9. CV202

    CV202 1/2 ton status

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    Yes, some models came with a cat that has a port on it that the dealer can remove to replace the catalyst inside of it. Don't know how much it would cost. You might be better off just going with a high flow cat. It'd flow better and probably cost less.

    Why do people keep calling it a Bronco!!!!! [​IMG]
     
  10. 90K5

    90K5 1/2 ton status

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    I put a hi-flow one on mine and it got louder. Its a CAtco

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     

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