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Shorty headers for an LX: Worth it?

Discussion in 'Performance' started by Tommy Boy, Jun 1, 2017.

  1. Dave Z

    Dave Z It's me, Dave Staff Member Supporter

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    When it comes down to it, trading for a 392 may be more cost effective... or are we talking about a 392 already?

    I hate that answer as a recipient, as I got it back when I wanted to upgrade my Sundance and was told to trade it in on a turbo — and they were right.
     
  2. Mike V.

    Mike V. Moderator Level 2 Supporter

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    Find a set of stock SRT exhaust manifolds and mid pipes. They can be found for under $300 and are factory short tube headers.

    You will need a 2.75 to 2.5 adapter to attach your stock R/T.

    I have these installed on my 2009 R/T... the difference is night and day.

    Mike
     
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  3. wtxiceman

    wtxiceman Member Level III Supporter

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    255
    Would they work on a 5.7 in a 1500?
     
  4. Mike V.

    Mike V. Moderator Level 2 Supporter

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    I don't know. Physically they will fit the head, will they clear the frames rails or anything else? I don't know.

    Mike
     
    wtxiceman likes this.
  5. Tomguy

    Tomguy Member Level 2 Supporter

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    455
    I doubt it, but SRT Jeep ones might.

    As for power gains from them, figure 5-10 HP if you have supporting mods, ex: Cam, heads, etc.
    The best power gains for a 5.7 is a cam & valve spring upgrade. I was going to do it on my Charger, wound up trading in for the Jeep instead. That's 30-45HP depending on the cam, tune, etc. And cost is probably not even double what your headers & install would run. Not a 6.1 or 6.4 stock cam but a custom grind. Check LX Forums for ideas & what people run. The one I had in hand was an FRI Hellfire cam, which was about 40HP more with just the cam, springs, and CAI Diablo tune.
     
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  6. Fast Eddie

    Fast Eddie Valued Member Level III Supporter

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    All of a sudden a story came to mind from my dyno days at Chrysler when we were doing the rating runs ( numbers for advertising). I was running "full spread" of runs from full gross to full net (which is the way the engine is equipped with in the car) all the way to a complete car exhaust system for a 383 Road Runner engine. So I got to the last run where I had to put on the chrome exhaust tips and run a final test. We were really surprised when we lost around 5 HP by putting the tips on. So we ran the test 2 more times and the same thing happened so we just used the numbers for the test without the chrome tips. Could never figure out why it happened. When I ran the same type of tests on the 440 there was no loss so it was one of those quirks you can't figure out.
     
  7. Tommy Boy

    Tommy Boy Member

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    17
    I would think changing out the mid pipes would necessarily require a re-tune because of the different cats?
     
  8. Mike V.

    Mike V. Moderator Level 2 Supporter

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    No. A catalytic converter is a catalytic converter.

    Mike
     
    Tommy Boy likes this.
  9. DC-93

    DC-93 Member

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    634
    Another story - on DC-93, when it was still a Charger 500, they discovered the outlet angle cut of the exhaust dumps changed lap times by up to 1/2 second per lap at Daytona!! That is huge for a simple bologna slice!
    They surmised the air going by the dumps was pulling out the exhaust pulses.
     
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