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Looking for exhaust advice on 90 K5

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Madbomber88, Apr 9, 2001.

  1. Madbomber88

    Madbomber88 1/2 ton status

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    I've got a stock 90 K5. Muffler finally rusted completely off. Just have exhaust to cat now. I live in Mass, and this thing is gonna have to pass emissions for the rest of its life with the new state inspections. It has 150,000 miles on it, runs like a top, no rust anywhere, a real gem, (it was owned by a heart surgeon in NYC who babied it, but that won't last long). So I want to put a better exhaust system on it. I'm not going to put headers on until I put in a new engine in a few years. I'm looking for a cat back system, possibly a dual. Only one I have looked at is the gibson single side nickel chrome system from performancecombos.com. I don't care too much about sound, as long as it is quiet at cruising speeds. I would like more off the line power. I know you guys probably have forgotten more about this stuff than I even know, so I am turning to you for advice. Looking to keep it under $300. Any info is always appreciated
    -Tim
     
  2. muddin4fun

    muddin4fun 3/4 ton status

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    I think Borla makes a nice cat back system. I would go to an exhaust shop and have them replace the pipe from the cat back with a flowmaster. 50-series is what I'm running and it's quiet inside, makes a statement out side and sounds awsome when floored! (p.s go with 2 1/2" pipe)

    [​IMG]
    <A target="_blank" HREF=http://k5chevyblazer.homestead.com/home.html>http://k5chevyblazer.homestead.com/home.html</A>
     
  3. Madbomber88

    Madbomber88 1/2 ton status

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    Thanks for the info. Why do you say to go with a 2 1/2" as opposed to 3"?
     
  4. James90

    James90 1/2 ton status

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    this might not help you but on my 90 I got true dules off the manafold with 2.5" pipe a cat on each side from catco the out behind the rear wheel with a 3.5" tip and it sounds great but I am not sure if it will pass emissons

    [​IMG]If you want to run cool
    you got to run on Heavy Heavy Fuel

    <A target="_blank" HREF=http://www.trailblazer90.coloradok5.com>http://www.trailblazer90.coloradok5.com</A>
     
  5. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    2 1/2" for true duals is plenty, 3" for single. The flow would be about the same. 3" duals for a stock small block is just too big.

    Rene

    [​IMG]<A target="_blank" HREF=http://jules.coloradok5.com>http://jules.coloradok5.com</A>
     
  6. CaptCrunch

    CaptCrunch 1/2 ton status

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    I bought my truck w/ the single Gibson cat back exhaust. It's ok I guess... not loud enough for my taste, but if you want a little extra growl at idle and when ya nail the gas it's great. Interior resonance (sp?) is very low... also very quiet cruising... probably the equivalent of one of the quietest flowmasters. Performance isn't all that great... for performance I'd get some shorties dumpining into a hi-perf cat and duals.

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  7. muddin4fun

    muddin4fun 3/4 ton status

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    If you get the pipe too big, then it'll help your hp but actually lessen the torque. If you aren't running headers, then 2 1/2 is enough. I had a pick up with 2 1/2 pipe, single, and it was fine. 3" i think is a little large for a small block. That's what diesels run and that's just too much for a small block. Your Y-pipe is prolly 2 1/2 so if you go 3, its a waist cause it's already restricted to 2 1/2. You want some back pressure or your torque suffers. You might run 3" where it comes to a single and the 2 1/2 where it splits out to the back if you really want 3" pipe. Just my .02.

    [​IMG]
    <A target="_blank" HREF=http://k5chevyblazer.homestead.com/home.html>http://k5chevyblazer.homestead.com/home.html</A>
     
  8. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Hey Lara, my old '88 GMC shortbox came factory with a 2 1/2" Y pipe into a 3" single pipe, through the cat and into the mufler with dual 2 1/2" tail pipes. Sounded nice for stock. I replaced it with a cat back system, can't remember the brand now (almost 10 years ago...)

    Rene

    [​IMG]<A target="_blank" HREF=http://jules.coloradok5.com>http://jules.coloradok5.com</A>
     
  9. muddin4fun

    muddin4fun 3/4 ton status

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    Interesting.....

    You might want to put a leash on that turtle..LOL!

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    <A target="_blank" HREF=http://k5chevyblazer.homestead.com/home.html>http://k5chevyblazer.homestead.com/home.html</A>
     
  10. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Still waiting for him to drown in his own drool! At least he hasn't picked up on some other dog habits (like Westy's dogs...[​IMG])

    Rene

    [​IMG]<A target="_blank" HREF=http://jules.coloradok5.com>http://jules.coloradok5.com</A>
     
  11. muddin4fun

    muddin4fun 3/4 ton status

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    LMAO!!!

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    <A target="_blank" HREF=http://k5chevyblazer.homestead.com/home.html>http://k5chevyblazer.homestead.com/home.html</A>
     
  12. solowookie

    solowookie 1/2 ton status

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    my exhaust is definately NOT emissions legal, but I'll have to give you a vote for the flow masters!!! They sound really good.

    Jeff
     
  13. Chris Demartini

    Chris Demartini 1/2 ton status

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    <font color=blue>Get a high-flow cat and a Flowmaster 50 series. Go down to the local exhaust bender and tell him what you want. If you find the right shop, it shouldnt be more than a regular cat-back and you have it built to your specs.</font color=blue>

    [​IMG]
     

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