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Anyone running High flow Cats?

Discussion in 'Performance and Tuning' started by Tracker, Jul 19, 2016.

  1. Jul 19, 2016 at 9:39 PM
    #1
    Tracker

    Tracker [OP] New Member

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    Shane
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    Just curious as I continue to research my future exhaust. I have a 2001 Trans am that had SLP high flow cats. It failed emissions in Colorado even brand new. But when I went back to stock I noticed a huge loss of power and much quieter ride. I would probably have a bolt/unbolt system for emissions testing.
     
    trayday likes this.
  2. Jul 19, 2016 at 9:49 PM
    #2
    ColoradoTJ

    ColoradoTJ Calm your tits

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    I'm not sure about the cats, but this is what I would do in the past:

    - one set of cats was straight piped and put in using stainless steel exhaust bands (3-4" ones). The reason I did this was for visual inspection.

    - Once a year, I would take out the other cat and put in the factory one to run emissions tests.

    Worked well for me on my diesels and gas vehicles. Now we just have diesel emissions, so I don't sweat it.
     
    bandit likes this.
  3. Jul 19, 2016 at 9:51 PM
    #3
    Tracker

    Tracker [OP] New Member

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    Notice a big difference in power and response?
     
  4. Jul 19, 2016 at 9:56 PM
    #4
    ColoradoTJ

    ColoradoTJ Calm your tits

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    Nope. On the diesels I just finally left the factory cat it. Maybe @dirtydeeds can relay some of his exhaust wizardry upon us.

    Now on my old Trans Am, I actually put a resonator on it to quiet it down a bit. The rather large camshaft, headers and corsa exhaust got plenty of comments. Some were from traffic cops in the sign of a warning. Lol
     
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  5. Jul 19, 2016 at 10:32 PM
    #5
    trayday

    trayday New Member

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    7" BDS w/Bilstein 5100s, 20" Fuel Mavericks, 35x12.5 Nitto Terra Grapplers, Magnaflow 50 series muffler, Modiefied intake box w/AFE dry filter, PIAA super white bulbs, N-Fab steps, TRD Rear Sway Bar, Hypertech calibrator, TRD Pro shift knob
    I had an Infiniti m45s that I installed new mufflers, y-pipe (stock was 1 7/8") and cut out the secondary cats and replaced with test pipes. Big difference on the top end. Before the Y-pipe, at about 120mph the car would slowly increase speed. After the y-pipe and test pipes, it felt like there wasn't much holding it back and could climb to 150 pretty easily. This was before the tune.

    At the same time, I was commuting a lot so I bought an Integra GSR because the Infiniti didn't get the best mpg. I got bored and decided to build the motor and trans. With the pistons, cams, and everything else the car wouldn't pass smog. What I ended up doing was going to a shop that built motors and I would fwd them my registration information. They would then fwd my info to the DMV. Ended up being $300 every two years for smog.
     
  6. Jul 19, 2016 at 10:52 PM
    #6
    bandit

    bandit New Member

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    Duh Tundra
    You could just run the stock cats with whatever exhaust you want then flange it out right before them and run electric flapper Cutouts. That's what i did with all of the high performance sports cars I had.
     
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  7. Jul 19, 2016 at 10:52 PM
    #7
    bandit

    bandit New Member

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    Duh Tundra
    ^^^^ this be the cheaper route with the exact same results.
     
  8. Jul 20, 2016 at 8:50 AM
    #8
    Tracker

    Tracker [OP] New Member

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    I'v heard its not good to run them open all time time like that though. Not enough back pressure. I dont want to worry about if I am opening them at the right time or if I need to open them.
     
  9. Jul 20, 2016 at 9:28 AM
    #9
    bandit

    bandit New Member

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    Duh Tundra
    If you tune your car for the cut outs then you'll be fine.
     
  10. Jul 20, 2016 at 2:38 PM
    #10
    robie56

    robie56 New Member

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    mbrp exhaust, afe dropin filter, stubby antenna, Readylift leveling kit, ICI magnum RT sidesteps, weather techs front & rear
    Buy a catback system and save yourself alot of money and aggravation!
     
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